GroupDIY

Marketplace => White Market => Topic started by: ppa on May 16, 2009, 02:31:52 PM

Title: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: ppa on May 16, 2009, 02:31:52 PM
For contacts just PM me, thanks

Read all this post for other my products and infos before ordering, please.  8)




DOA'S - DISCRETE OPAMPS


APP14GE
very  low noise  germanium discrete operational amplifier

-->  available 

APP14GE is a germanium DOA that I have developed starting from my MA1 germanium pre.
It's a new DOA so it's not a clone of another one.  I have designed it both for line and preamp stages.
APP14GE uses both a germanium transistor and some silicon transistors.
The germanium transistor is placed on the best point to make sound.  As my MA1 preamp, APP14GE, has a warm vintage germanium sound. BTW it can use some different germanium transistors inside for getting different colors from.

Kits came with docs with assembly manual.

Kitset version prices with the NOS (new old stock) AF106 germanium transistor :

-15 euros pc for 1 to 3 pcs.
-12.5 euros pc for 4 to 10 pcs
-11.5 euros pc for 11 to 50 pcs

S&H and paypal fees excluded.

Kitset version prices with the NOS AF127  germanium transistor :

- 15.5 euro per pc for 1 pc 
- 15 euro per pc for 2 pcs
- 14.5 euro per pc for 3 to 6 pcs.
- 14 euro per pc for > 6 pcs. 

all these prices are S&H and PayPal fees excluded.


PCB's only prices:

- 6 euro per pc for 1 pc 
- 5.5 euro per pc for 2 pcs
- 5 euro per pc for 3 to 6 pcs.
- 4.5 euro per pc for > 6 pcs. 

S&H and paypal fees excluded.



APP992
high performances FET input discrete operational amplifier.


-->  available 


main features:
- ultra low noise (1nV/rt Hz)
- very high slew rate (75 V/uS)
- high class A operation
- drive 75 ohm
- can be powered from +-14V to +-25V , so it can use +-16V, +-18V , +-24V of power supply.
- very stable on unity gain.



assembled version prices :
40 euros pc for 1  pc.
32 euros pc for 2 to 10 pcs
30 euros pc for 11 to 50 pcs


S&H and paypal fees excluded.


kitset version prices :
15 euros pc for 1 to 3 pcs.
13 euros pc for 4 to 10 pcs
12 euros pc for 11 to 50 pcs


S&H and paypal fees excluded.

The docs include the assembly manual.

Support is at http://groupdiy.com/index.php?topic=49711.0

APP992 is not a version of the JE990 but a totally new DOA (my own design from my experience as electronic engineer).
I have designed it several years ago. It is a FET input DOA with modern design topology.
APP992 has a trasparent, neutral and clear sound with a FET mojo. Neutral but not cold.
It is used on many gears as eqs, compressors, pres,..etc...BTW is very used on Sontec eqs by many Diyers.
A few of comments on the web (not all):

http://www.gearslutz.com/board/9089219-post51.html

http://groupdiy.com/index.php?topic=27972.msg618444#msg618444

http://groupdiy.com/index.php?topic=48328.msg625302#msg625302

http://groupdiy.com/index.php?topic=50733.msg643430#msg643430

http://groupdiy.com/index.php?topic=55372.msg707043#msg707043

http://groupdiy.com/index.php?topic=41430.msg705366#msg705366

http://groupdiy.com/index.php?topic=54523.msg695933#msg695933


MIC/DI PREAMPS


APP Studio Ing.  MA1 germanium mic/di pre


      This mic pre uses both a germanium and some silicon transistors.
I have designed this gear to have the sound of germanium with the dynamic and the fast transients of my opamps. The germanium transistor is placed in the best point to make sound.
      MA1 an high performances gear with a lot of the warm that only a germanium transistor can do. It is designed for 500 rack chassis and so it works with dual 16V of power supply.
      It has 64 dB of gain max.

(http://home.teletu.it/APPSI/MA1%20photo2.JPG)

(http://home.teletu.it/APPSI/ma1%205%20reduced.JPG)

(http://home.teletu.it/APPSI/ma1ge%20ph18B.JPG)


MA1 can use several trasformers (some of Classicapi, Cinemag, Jensen, Altran and Lundhal),


PRICES:


ASSEMBLED UNITS:

- 420 Euro per one pc plus S&H and paypal fees.

- 390 Euro per pc for 2 to 3 pcs plus S&H and paypal fees.




KITS:

MEDIUM kit version:

- 36 Euro per one pc plus S&H and paypal fees.

- 34 Euro per pc for 2 to 4 pcs plus S&H and paypal fees.


The kit includes:

- chassis accessories: all screws, standoffs, bolts and washers.
- all resistors
- all semiconductors
- PCB
- all capacitors

are excluded the others components:

- chassis : front panel, L bracket, these ones are available at www.frontpanels.de  (contact me for them)
- the input and out transformers
- switches and switches'  caps (the buttons on the front panel)
- potentiometer
- potentiometer's knob.


BASIC kit version:

- 28 eur per one pc
- 26 eur per pc per two pcs
- 25 eur per pc from 4 to 6 pcs
- 24.5 eur per pc from 9 to 15 pcs

plus S&H and paypal fees.



The kit includes:

- chassis accessories: all screws, standoffs, bolts and washers.
- all semiconductors
- PCB

are excluded the others components:

- chassis : front panel, L bracket, these ones are available at www.frontpanels.de (contact me for them)
- the input and out transformers
- switches and switches'  caps (the buttons on the front panel)
- potentiometer
- potentiometer's knob
- all resistors
- all capacitors

PCB only:

the PCB is double face FR4 professional with gold plated holes and connectors.   

- 18 eur per one pc
- 17 eur per pc per two pcs

plus S&H and paypal fees.


the front panel and L bracket are available at www.frontpanels.de (contact me for them)

support thread: http://www.groupdiy.com/index.php?topic=49710.0








I/O board   

--> SOLD OUT! 



This high performances board can be used for many circuits to give them a balanced input and output (with makeup stage) when it is needed.

The IO Board is an input-output card, so it has an input section to unbalance signals from gears and a make-up stage to balance  signals from unbalance sources. Moreover, the IO board has an high impendance FET buffer to interface the make-up stage to very high impedance sources if required.

These very high performances input and out stage are both based on solid state technology and they can run with DOA's and/or IC opamps, so the customer can use many DOA's and IC opamps in the market.
Moreover, the out section has a zone for an output trasfomer to place easily it in 1U rack chassis, just using two screws. Can be used several trasformers (cinemag, jensen, classicapi) on it.

IO board can use all APP DOA's and many other DOA's as 2520, JE990 , JLM99....etc....
so you can choise the sound look basing on the DOA's (or IC opamps).

Just to note that it is also possible use the buffer plus the make-up stage as very high performance instrument amplifier with trasformerless or trasformer coupled out.
By the way it is possible use this board as line amplifier too, or both instrument and line amp.




(http://home.teletu.it/APPSI/io%20board%20100b.JPG)

I/O board has a new design for the input stage that does not use any electrolytic cap but only small 1uF polyester caps and a servo DC stage.
Moreover, a servo DC is present in the make-up stage too, to avoid any capacitor on input-output and in the nfb net.

This board was sold in a recent group buy with success so I would like to re-propose it to the market for who want a modern in-out interface.  I have launched a support thread for the IO board  here http://www.groupdiy.com/index.php?topic=46320.0

 
schematic: 
http://home.teletu.it/APPSI/IO_board_eq2.pdf

components list:
http://home.teletu.it/APPSI/IO%20BOARD%20BOM.pdf




PRICES:
for 1 to 2 pcs = 18 euro pc plus S&H and paypal fees (3.5%)
for 3 to 4 pcs = 16 euro pc plus S&H and paypal fees (3.5%)
for 5 to 10 pcs = 14 euro pc plus S&H and paypal fees (3.5%)






APP studio ing. "PICCOLO",
GAINCLONE LM3886 power amp card


--> available


very high performance module based on gainclone amplifier, PSU included in the same board, so you will buy amp + PSU inside the same board!



(http://home.teletu.it/APPSI/piccolo%2022%20009%20b.JPG)


APP studio ing PICCOLO  (PCB only):

one pc: 8 euros each plus S&H and paypal fees.
from 2 to 4 pcs= 6 euros plus S&H and paypal fees.
from 5 to 6 pcs= 5.5 euros plus S&H and paypal fees.
from 7 to 10 pcs= 5 euros plus S&H and paypal fees.

chassis available at www.designbuildlisten.com  (http://www.designbuildlisten.com)


APP STUDIO ING. PSU2 ,  CONFIGURABLE PSU BOARD KIT


--> available on the new 2014 version


This is an high performances PSU board designed for mic preamps.
I have designed this PSU board for the many requests of API 312 clone channels around here.
For this PSU project I started from the typical DIY preamp configuration of 2 or 4 pre channels inside 1u rack chassis. Moreover, if needed, the PSU can be easy set for dual 24V out for 4x M1 channels.
Since the space is very important when there are both 4 channels in the same 1u rack, I gone for a compact size PCB with narrow and long form.

This project was developed around the famous LM317 and LM337 IC regulators, with a design oriented for low noise and fast response to the load's current.


PSU's out voltages are set by 3 multiturn trimmers, one for each out.
the out voltages range is from +/-14V to -/+28V on main outs

The APP PSU2 has dimensions of 5.28 inch X 2.05 inch (13.4 cm X 5.2 cm )  
and is made with a professional FR4 two layers PCB.


current specs:
main outs=  +/-800mA (with proper heatsink)
+48 out = 50 mA


PRICES:

one APP studio PSU2 kit:

prices (S&H prices exluded).

22 euros 1 pc,
20 euros from 2 to 3 pcs,
18 euros from 4 to 10 pcs


APP studio PSU2 PCB only:

one pc: 8 euros each plus S&H and paypal fees.
from 2 to 4 pcs= 7 euros plus S&H and paypal fees.
from 5 to 6 pcs= 6 euros plus S&H and paypal fees.
from 7 to 10 pcs= 5 euros plus S&H and paypal fees.
from 11 to 20 pcs= 4 euros plus S&H and paypal fees.  



Note: Power Transformer not included.





APP1040 mic/di preamp board.

         This is a new design mic/DI preamp board with high performances, to be precise it is not a 312/512 clone or M1 clone but another best.
         It can use several trasformers on input and on out and also all my DOA's, and moreover a lot of other DOA's in the market as the 2520 and the JE-990 too.  









APP STUDIO ING. METER 2 ,  CONFIGURABLE 10 LED METER

--> available 

METER 2 is an high performances meter using 10 LED's (it can be used with 8 led's too) and the LM3915 led driver.
It has power supply voltages that go from +-16V to -+24V, regulated or unregulated.
The 0 dbu LED can be set using a trimmer. Each step is of 3 dB.
Changing some resistors' values it is possible to re-define the LED scale.
The meter in the following pic is set with the scale that goes from -12 dbu to +15 dbu.
Being a new product are availables only the PCB's at the price of 9 euros each plus S&H.




(http://home.teletu.it/APPSI/meter2%20%20pic14.JPG)






for contacts PM me

Disclaimer (it must be read before ordering and/or paying):
- These products must not be used inside equipment for sale. Commercial use is denied without written and signed authorization of the product's designer (Pier Paolo Abbate).
- jurisdiction for any legal dispute is Italian, in any case the competent court is the court of Palermo in Italy.
- there is no warranty on these products, the seller does not assume any liability and/or any penalty for them in any case.
- these products can be very dangerous so they are only for persons who are very expert in electronics, if you're not very expert in electronics, than do not buy these products.
- these products must NOT be used for life supporting and/or for military applications in any case.
- these products are NOT suitable for life supporting and/or for military applications.
Title: Re: APP2050 op amp ver.5
Post by: tmuikku on May 16, 2009, 02:35:51 PM
Hello, put me down for two, ill put you pm or email soon
Title: Re: APP2050 op amp ver.5
Post by: jdbakker on May 16, 2009, 02:37:30 PM
For that kind of money I'll take two.

JDB.
Title: Re: APP2050 op amp ver.5
Post by: shabtek on May 16, 2009, 02:44:04 PM
i'd take 2
Title: Re: APP2050 op amp ver.5
Post by: doubleroger on May 16, 2009, 02:46:56 PM
I'd like a pair of those, please :)
Title: Re: APP2050 op amp ver.5
Post by: dfer on May 16, 2009, 03:06:34 PM
Im in for two
Title: Re: APP2050 op amp ver.5
Post by: Tubemooley on May 16, 2009, 03:11:40 PM
I will take two of those. I will attempt to PM you or e-mail you right after this. Dana Walcott.
Title: Re: APP2050 op amp ver.5
Post by: Engfelt2000 on May 16, 2009, 03:49:05 PM
two for me please :)

Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 04:42:38 PM
Thanks all for your interest,

for the first 4 Customers I can send to them very soon the op amps because I've these op amps in stock, for the next customers there is a lead time of a week or at limit two, sorry, but I have ready to send out only 8 op amps, I'm selling three operational I have reserved for me too.

Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 04:51:18 PM
Hello, put me down for two, ill put you pm or email soon

ok, just email sent.
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 04:53:20 PM
For that kind of money I'll take two.

JDB.
ok, just message sent to you.
thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 05:02:18 PM
i'd take 2
ok, send me an email at my address [email protected] with shipping details please.
thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 05:03:55 PM
I'd like a pair of those, please :)
ok, message sent to you with total with shipping cost included to the (very beatiful) Paris.
Thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 05:10:57 PM
two for me please :)


since the raccomandated mail service cost less for Oslo for two op amp and it's 5 euro (the parcel service is 6 euro) the total prices became 45 euro. This shipping prices is the same for all Europe for all European the total price for two op amps is 45 euro.

Thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 05:14:23 PM
Im in for two
ok, for the Ireland two op amp shipping included are 46 euros,  I can send out soon as well as possible.

Thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 05:15:13 PM
I will take two of those. I will attempt to PM you or e-mail you right after this. Dana Walcott.

ok, emails just sent.
Thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: Sredna on May 16, 2009, 05:40:46 PM
Ciao Pier Paolo!

Just sent you an email about two DOAs....

Best regards,

Anders
Title: Re: APP2050 op amp ver.5
Post by: keefaz on May 16, 2009, 05:42:54 PM
Hello, it's 23:41 here, is it too late for 2 opamps ?
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 05:57:57 PM
Ciao Pier Paolo!

Just sent you an email about two DOAs....

Best regards,

Anders
ok, email sent
Thanks and kind regards
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 05:59:15 PM
Hello, it's 23:41 here, is it too late for 2 opamps ?

no, it isn't but the lead time is around a week for this order, email sent to you.
Thanks and kind regards
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: tmuikku on May 16, 2009, 06:03:18 PM
Hi, didn't receive email (wasn't on junkbox either), put another pm a while go. getting worried  ;)
Title: Re: APP2050 op amp ver.5
Post by: keefaz on May 16, 2009, 06:08:23 PM
no, it isn't but the lead time is around a week for this order, email sent to you.
Thanks and kind regards
Pier Paolo
Ok great, I sent the payment thanks!

Your DOAs won't burn at +/-24VDC supply ?
How much voltage supply would you suggest for your opamps, for using them efficiently and in long term ?
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 06:13:45 PM
no, it isn't but the lead time is around a week for this order, email sent to you.
Thanks and kind regards
Pier Paolo
Ok great, I sent the payment thanks!

Your DOAs won't burn at +/-24VDC supply ?
How much voltage supply would you suggest for your opamps, for using them efficiently and in long term ?
My DOA can run at +/-24VDC supply without problems ,moreover, it uses a high thermal conductive resin to reduce stress.
Thanks for the payment.
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 06:19:04 PM
Hi, didn't receive email (wasn't on junkbox either), put another pm a while go. getting worried  ;)
email sent to you
Thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 06:29:05 PM
Ciao Pier Paolo!

Just sent you an email about two DOAs....

Best regards,

Anders
thanks for the payment
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 06:48:13 PM
Im in for two
since the raccomandated mail service cost less for Oslo for two op amp and it's 5 euro (the parcel service is 6 euro) the total prices became 45 euro. This shipping prices is the same for all Europe for all European the total price for two op amps is 45 euro.

Thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 06:52:13 PM
I'd like a pair of those, please :)
thanks for the payment.
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 06:54:02 PM
Attention please,

for all European the shipping cost are 5 euros because I will send the op amps with raccoamndated mail service.
Thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 06:58:10 PM
Hi, didn't receive email (wasn't on junkbox either), put another pm a while go. getting worried  ;)

message sent
thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 16, 2009, 08:22:36 PM
a photo of the 2050
Title: Re: APP2050 op amp ver.5
Post by: Skylar on May 16, 2009, 09:18:35 PM
I'd like 2!

I just sent you a mail.

~Skylar

Title: Re: APP2050 op amp ver.5
Post by: lotus on May 16, 2009, 09:52:45 PM
 I would like a pair for me please
I will send you an email. Thanks Pier
Title: Re: APP2050 op amp ver.5
Post by: jdbakker on May 17, 2009, 12:51:54 AM
PayPal sent.

Thanks,

JDB.
Title: Re: APP2050 op amp ver.5
Post by: kibadachi on May 17, 2009, 01:38:52 AM
a pair for me please


thanks.
Title: Re: APP2050 op amp ver.5
Post by: tmuikku on May 17, 2009, 02:21:24 AM
Got your mail and just paypalled. Thanks!

Title: Re: APP2050 op amp ver.5
Post by: ppa on May 17, 2009, 06:05:21 AM
Got your mail and just paypalled. Thanks!



thanks for payment
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 17, 2009, 06:11:36 AM
a pair for me please


thanks.

ok, email sent
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: pacemaker on May 17, 2009, 06:35:15 AM
would like 2 please,
is your offer still available ?
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 17, 2009, 07:27:11 AM
would like 2 please,
is your offer still available ?
ok, the total is 45 euros shipping included , the lead time for this order (I should build these op amps) is in range 6-12 days (more 6 than 12), thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 17, 2009, 07:29:01 AM
I would like a pair for me please
I will send you an email. Thanks Pier
ok, I wait your email.
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: kibadachi on May 17, 2009, 08:39:14 AM
Got your mail and paypalled 45 euro.


Thanks
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 17, 2009, 08:41:43 AM
Got your mail and paypalled 45 euro.


Thanks
thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: pacemaker on May 17, 2009, 12:43:54 PM
Hi PPA,
just paypalled the 45€ for 2 APP2050 !
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 17, 2009, 12:52:27 PM
Hi PPA,
just paypalled the 45€ for 2 APP2050 !

thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: Skylar on May 17, 2009, 01:36:23 PM
Paypal $$$ sent!
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 17, 2009, 03:21:56 PM
Paypal $$$ sent!

thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: owel on May 17, 2009, 05:59:43 PM
Pier, Looks good!

Are these using Millmax pins now?

I will contact you later this month or early next for a quote.
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 17, 2009, 06:51:25 PM
Pier, Looks good!

Are these using Millmax pins now?

I will contact you later this month or early next for a quote.
yes, they are original Millmax pins.

Title: Re: APP2050 op amp ver.5
Post by: DIYnoob! on May 18, 2009, 01:24:56 AM
i'd like one of these pier. email me!
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 18, 2009, 03:10:55 AM
i'd like one of these pier. email me!
email sent.
Thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: peterc on May 18, 2009, 03:34:10 AM
Hi Pier

Any left? I'd like a pair......

Many thanks
Peter
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 18, 2009, 04:22:21 AM
Hi Pier

Any left? I'd like a pair......

Many thanks
Peter
for two op amps the total is 20+20+6=46 euros at my paypal address ppabbate AT tele2.it , lead time of
7-12 days.
thanks
kind regards
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: memestudio on May 18, 2009, 05:08:25 AM
Ciao PierPaolo,
1 pm per te.
Fabio
Title: Re: APP2050 op amp ver.5
Post by: b0b on May 18, 2009, 01:06:41 PM
I'll take a pair as well if I'm not too late. Can't say no at this price  :)
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 18, 2009, 03:57:51 PM
I'll take a pair as well if I'm not too late. Can't say no at this price  :)
ok, message sent to you
thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 18, 2009, 04:10:05 PM
For that kind of money I'll take two.

JDB.
Hi JDB,

since now I use the shipping service with raccomandated mail service that's 5 euro, but you have paid me 6 euros for the previus shipping service that I wanted to use , I have sent 1,1 euro (0,1 euro for paypal fee) to resend to you the 1 euro that exceeded.
Regards.
Pier Paolo


Title: Re: APP2050 op amp ver.5
Post by: jdbakker on May 18, 2009, 04:23:32 PM
since now I use the shipping service with raccomandated mail service that's 5 euro, but you have paid me 6 euros for the previus shipping service that I wanted to use , I have sent 1,1 euro (0,1 euro for paypal fee) to resend to you the 1 euro that exceeded.

Thank you, that's very fair and precise of you.

JDB.
Title: Re: APP2050 op amp ver.5
Post by: DIYnoob! on May 18, 2009, 04:56:43 PM
payment sent pier!

Thanks again
Title: Re: APP2050 op amp ver.5
Post by: Grooveteer on May 19, 2009, 06:17:04 AM
Hi Pier,

I'd like 2 if possible.  (sent you an email as well)

Thanks.

G
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 19, 2009, 07:51:16 AM
Hi DIYnoob! thank you
Pier Paolo

Hi Grooveteer, I've just sent you an email.
Thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: Grooveteer on May 19, 2009, 08:05:48 AM
Replied & Paid  ;)
Title: Re: APP2050 op amp ver.5
Post by: 1954U1 on May 19, 2009, 03:05:04 PM
2 for me too!
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 19, 2009, 05:28:03 PM
Replied & Paid  ;)
thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 19, 2009, 05:28:32 PM
2 for me too!
mail sent
Title: Re: APP2050 op amp ver.5
Post by: 1954U1 on May 19, 2009, 07:08:29 PM
Thanks a lot!

just paid.
Title: Re: APP2050 op amp ver.5
Post by: Tubemooley on May 20, 2009, 04:51:05 AM
Technically it's none of my business. But it looks like you have sold about 20 APP2050's here Pier. That's great. Get your amplifiers out there. This was a really good idea. If you decide to hold any one-day sales on sanity, please let me know in advance. Thanks, DANA.
Title: Re: APP2050 op amp ver.5
Post by: structuredloud on May 20, 2009, 05:33:41 PM
I'd take two. (pm sent)
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 20, 2009, 05:54:26 PM
I'd take two. (pm sent)
ok, mail sent because you have the message full
Thanks
Pier Paolo.
Title: Re: APP2050 op amp ver.5
Post by: azander on May 22, 2009, 01:03:05 AM
id like 2. sent pm.
Title: Re: APP2050 op amp ver.5
Post by: azander on May 22, 2009, 05:24:48 PM
paypaled for two and sent mail!

thanks!
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 22, 2009, 05:33:29 PM
paypaled for two and sent mail!

thanks!
thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: lotus on May 23, 2009, 12:00:59 PM
 Paid for a pair of 2050. Thanks PPA
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 23, 2009, 05:14:53 PM
Paid for a pair of 2050. Thanks PPA
thanks.
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 24, 2009, 01:24:01 PM
the current stock just finished and tested
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 25, 2009, 03:58:01 PM
Parcels ready to go out
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 26, 2009, 08:43:48 AM
7 parcels sent. I'm going to send others tomorrow.
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 27, 2009, 10:31:25 AM
other 6 parcels sent. I'm going to send others tomorrow, e-mails sent
Title: Re: APP2050 op amp ver.5
Post by: dukasound on May 28, 2009, 08:10:22 AM
Money sent for 2 doa's
Thanks
Duka
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 28, 2009, 05:49:44 PM
Money sent for 2 doa's
Thanks
Duka
thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 29, 2009, 09:24:35 AM
other 6 parcels sent (with raccomandated mail service)
Title: Re: APP2050 op amp ver.5
Post by: ppa on May 29, 2009, 01:58:20 PM
parcels sent for

tmuikku
jdbakker
shabtek
doubleroger
Tubemooley
Sredna
keefaz
Skylar
lotus
kibadachi
DIYnoob!
peterc
Grooveteer
structuredloud
azander

and other 4

Title: Re: APP2050 op amp ver.5
Post by: doubleroger on June 03, 2009, 06:45:31 PM
My parcel arived today,
thanks!
Title: Re: APP2050 op amp ver.5
Post by: 3nity on June 03, 2009, 06:53:22 PM
are they still available?
I'm ready for my next 4 channel box.
Title: Re: APP2050 op amp ver.5
Post by: ppa on June 04, 2009, 04:08:59 PM
are they still available?
I'm ready for my next 4 channel box.
I'm going to made a new stock of 50 pcs of 2050s. Will be avaiables around 10 pcs per week, I think.
The first 10 pcs will be ready for 12th of this month.
Prices depend of quantity.

Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: API on June 06, 2009, 04:35:23 AM
Hi.

I would like to get at least 2 but up to four of these.
Will check back in the thread to see when they are ready or feel free to PM me when they are.

API
Title: Re: APP2050 op amp ver.5
Post by: ppa on June 06, 2009, 09:33:58 AM
Hi.

I would like to get at least 2 but up to four of these.
Will check back in the thread to see when they are ready or feel free to PM me when they are.

API

Hi,

I will send you a message or an email when they will be ready to go out, ok for 4 pcs.
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: memestudio on June 09, 2009, 03:05:24 AM
I placed an order for  2x2050 e 2xAPP10. I want to use the APP10 in a Sontec clone.
Fabio
Title: Re: APP2050 op amp ver.5
Post by: ppa on June 10, 2009, 05:34:54 AM
Money sent for 2 doa's
Thanks
Duka
money just arrived
thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5
Post by: tmuikku on June 11, 2009, 06:53:01 AM
Got mine last week, thanks! They look super and looking forward to get em tested
Title: Re: APP2050 op amp ver.5
Post by: ppa on June 18, 2009, 08:45:56 AM
I've made 10  2050 op amps but there are just sold in these days
Title: Re: APP2050 op amp ver.5
Post by: MartyMart on June 24, 2009, 06:16:56 AM
I would like 2 2050's but no rush, a week or two is fine, will mail you
Regards,

Marty.
Title: Re: APP2050 op amp ver.5
Post by: ppa on June 24, 2009, 03:55:25 PM
I would like 2 2050's but no rush, a week or two is fine, will mail you
Regards,

Marty.

mail sent
thanks
Title: Re: APP2050 op amp ver.5
Post by: dukasound on July 01, 2009, 04:17:48 AM
I received doa's.
Nice!
Duka
Title: Re: APP2050 op amp ver.5
Post by: ppa on July 04, 2009, 01:44:23 PM
I've some 2050's for sale, I've 10 2050's reserved for this forum members.
Now there are 8 ready to go out only.


The prices are the same 20 euros each one.

Scuse me all for the long time but all 2050 are made by hands and tested two times and I've received several  orders.      

Thanks
Regards
Pier Paolo
Title: Re: APP2050 op amp ver.5 ------ N°8 units ready to send out.
Post by: ppa on July 05, 2009, 03:15:45 PM
Several my customers told me 2050 is a top level op amp, very good from rock to classic music.

A comment from Skylar:

http://www.groupdiy.com/index.php?topic=33501.msg418448#msg418448

Title: Re: APP2050 op amp ver.5 ------ waiting for new stock
Post by: ppa on July 05, 2009, 07:45:05 PM
two op amps sold to MartyMart and 9 pre-ordered from Owel.
Title: Re: APP2050 op amp ver.5 ------ waiting for new stock
Post by: Whoops on July 05, 2009, 08:26:46 PM
I would like to buy 2 opamps,
do you have any in stock?

thanks
Title: Re: APP2050 op amp ver.5 ------ waiting for new stock
Post by: ppa on July 06, 2009, 09:54:58 AM
I would like to buy 2 opamps,
do you have any in stock?

thanks

I've sold all to Owel and MartyMart, but in 3 days I will have other N°8  2050 ready to go,
For two 2050s prices are 2x20=40 euros for op amps, for postal services there're.

- raccomandated mail service : 7 euros for Europe, 8 euros for USA and rest of the World.

- priority mail service: 1.70 for Europe , 1.85 for USA and 2,10 for Australia and New Zealand, Japan, Korea   and HW and other Countries.

I do regular export invoice or EU (European Union) invoice,  for EU VAT are included and fixed to 20% (Italian VAT).  

Pier Paolo
Title: Re: APP2050 op amp ver.5 ------ waiting for new stock
Post by: 1954U1 on July 07, 2009, 09:15:49 PM
paid for 4 opamps  ;D
Title: Re: APP2050 op amp ver.5 ------ waiting for new stock
Post by: Whoops on July 08, 2009, 03:19:33 AM
Paid for 2 OPAmps,
please use priority mail service

thanks
Title: Re: APP2050 op amp ver.5 ------ waiting for new stock
Post by: ppa on July 08, 2009, 12:49:16 PM
paid for 4 opamps  ;D
thanks for buying other 4 2050's from me after the first 2.

Pier Paolo
Title: Re: APP2050 op amp ver.5 ------ N°4 units ready to send out
Post by: MartyMart on July 11, 2009, 06:13:29 AM
Got mine this morning, thanks Pier they look totally "pro" :-)

Marty.

EDIT - Just tried them today in my "DIY Stripboard 312" clone and they sound wonderful :-)

Very full and warm, these will get a LOT of use, thanks Pier.

MM.
Title: Re: APP2050 op amp ver.5 ------ N°4 units ready to send out
Post by: MikeClev on July 27, 2009, 06:34:05 AM
Hello!
Money paypalled for 2 APP2050 opamps to my address in the UK. I sent the money to: [email protected] - Thats still right isn't it?

I'm looking forward to hearing these babies sing!

Thanks in advance!

Mike C
Title: Re: APP2050 op amp ver.5 ------ N°4 units ready to send out
Post by: ppa on July 27, 2009, 07:27:15 AM
Hello!
Money paypalled for 2 APP2050 opamps to my address in the UK. I sent the money to: [email protected] - Thats still right isn't it?

I'm looking forward to hearing these babies sing!

Thanks in advance!

Mike C
tomorrow I will send out the parcel to you
thanks
Pier Paolo
Title: Re: APP2050 op amp ver.5 ------ waiting for new stock
Post by: 3nity on July 27, 2009, 09:58:13 AM
whats the shipping rate to Montreal, Canada?
Thanks
Title: Re: APP2050 op amp ver.5 ------ waiting for new stock
Post by: ppa on July 27, 2009, 11:43:08 AM
Hi Jeorge,

depend of shipping service (and quantity), for Canada and for two to four op amps are the following:

- priority mail service: 1.85 euros
- raccomandated mail service : 8 euros

with priority mail the shipping is faster than with raccomadated mail even if these two services are both however fast.
 
Pier Paolo

Title: Re: APP2050 op amp ver.5 ------ waiting for new stock
Post by: ppa on July 29, 2009, 05:05:33 PM
Hi Mike,

the parcel is sent today

kind regards
Pier Paolo
Title: Re: APP2050 op amp ver.5 ------ waiting for new stock
Post by: MikeClev on August 06, 2009, 01:07:31 PM
Received them a couple of days ago, they look very professional! I'm going to build a little summing unit with these 2 as the make-up gain opamps  ;D

If I like what I hear I'll probably be ordering a few more...

Thanks!

-Mike C
Title: Re: APP2050 op amp ver.5 ------ 5 pcs of APP2050 ready for sale
Post by: Kingston on September 09, 2009, 12:31:15 PM
Got the opamps today. Thank you! Can't wait to put the FET version side by side with the standard. Maybe I'll learn a thing or two, first time playing with DOA's afterall. Too bad I still haven't got most of the rest of the project done yet.
Title: Re: APP2050 op amp ver.5 ------ 5 pcs of APP2050 ready for sale
Post by: Arno on September 10, 2009, 03:47:05 AM
I'd like to take four !!

how does it work ?
I can't seem to find your email address

mine is arnolievens(at)gmail(dot)com

kr
arno
Title: Re: APP2050 op amp ver.5 ------ APP2050 FET version (called APP2055)
Post by: MikeClev on September 21, 2009, 06:07:45 PM
I just finished building an API style Mic Pre with one of these APP2050s and a Lundahl 1550 Transformer- it sounded Divine! Absolutely fantastic. I've never heard a better sounding mic pre. Very detailed and pure, with none of the harshness I hear in my other (much cheaper) mic pres. I've not heard any other 2520 Opamps, but I have a couple of GAR2520 kits waiting to be built. I will test them alongside as soon as I can!
Title: Re: APP2050 op amp ver.5 ------ APP2050 FET version (called APP2055)
Post by: ppa on September 22, 2009, 01:53:34 AM
Thank you very much
Title: Re: APP2050 op amp ver.5 ------ APP2050 FET version (called APP2055)
Post by: Kingston on September 29, 2009, 02:44:47 AM
I wrote about this to you already Pier Pablo, but I have to say it here as well.

Today I was finally able to take the op amps into use.

They are just INCREDIBLE!! The Sontec EQ is a great test application because I was able to compare your DOA's to a sound I am very familiar with (OPA604). There are two opamps in series (input & output) so any bad or good effect will be easily audible. OPA604 sounds clearly harsh in comparison to your gems.

I first replaced one channel with the APP2050 5.2 version and was completely blown away. My experience has been with transformer coupled tube gear and opamps only, and I had no idea a DOA can easily rival (or better!) a high class tube sound in clarity.

To be honest, I did not expect the FET version to be remarkably better, but then I replaced the other channels OPA's. and there was certainly overall more accurate sound. I prefer the FET version of these two.

I can imagine a preamp with the APP2055 (+APP2055servo) and some high end transformers would probably have no rivals.  :o

Now I just have to decide which one to build. Or maybe an all DOA EQ.

I will definitely need more of these in the future. Lots more.
Title: Re: APP2050 op amp ver.5 ------ APP2050 FET version (called APP2055)
Post by: desol on September 29, 2009, 06:56:39 PM

I will definitely need more of these in the future. Lots more.

Sounds about right. Price is more than fair as well.
Title: Re: APP2050 op amp ver.5 ------ APP2050 FET version (called APP2055)
Post by: ppa on October 01, 2009, 05:25:29 PM
Thank you very much Kingston and desol
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ------
Post by: desol on October 02, 2009, 06:33:58 PM
Your welcome Pier, and thank you too! I'll watch for the shipment.

Darrick
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ---
Post by: mik on October 05, 2009, 08:07:13 AM
I've build the FF opto comp, With the 2050 coupled with Cinemag CMOQ-2L .... it is just incredible..!!

many compliment Pier !

M.
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ------
Post by: ppa on October 05, 2009, 10:49:45 AM
thank you very much Mik.
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ------
Post by: indigom on October 14, 2009, 05:06:35 PM
Sent money Oct 6 for two FETs, received to North East Coast, USA on Oct 13th.

Now to build some access-312's and other circuits to try these out!

thanks Pier and cheers~
Jay
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ------
Post by: desol on October 14, 2009, 06:37:48 PM
Awesome Pier, received them today.
Chunky little buggers? They got some weight to 'em.
Must be somethin' good in there.  8)
Hello 553's.
Cheers. Darrick.

  (http://img504.imageshack.us/img504/2741/dsc02314.th.jpg) (http://img504.imageshack.us/i/dsc02314.jpg/)


Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ---
Post by: Minguta on December 12, 2009, 05:37:49 PM
I'd like to take 4 of APP2050. I'm in Thailand. Can you ship to my country?
my email is minguta(at)hotmail(dot)com

Cheers.
Minguta.
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ------
Post by: ppa on December 12, 2009, 06:44:12 PM
yes, I can ship to Thailand with registered mail service.
kind regards
Pier Paolo
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ------
Post by: dingo on December 20, 2009, 02:41:42 PM
hello! Pierpaolo
I'd like to take 2 or 4 of APP2050.
are available? price ?
I am in italy
thank you!
dingo.
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ---
Post by: Minguta on January 13, 2010, 04:14:50 AM
Got it today.
Thank you so much  ;D ;D ;D
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ------
Post by: ppa on January 23, 2010, 02:30:37 PM
a photo of the APP2050
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ------
Post by: ppa on January 23, 2010, 02:36:16 PM
and the new APP99F with APP2055
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ---
Post by: Minguta on January 30, 2010, 03:08:03 PM
Wait for APP99 FET  ;D ;D ;D
Can use with 24V?
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ---
Post by: ppa on February 02, 2010, 02:34:12 PM
Wait for APP99 FET  ;D ;D ;D
Can use with 24V?

Yes, you can.
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ------
Post by: Tubemooley on February 17, 2010, 06:02:25 AM
Excellent product development work going on at APP studio ing. I hope you don't mind if I re-cap your products briefly. I'm doing this mostly for myself.
APP2050 = standard, Class A DOA.
APP2050E = high Class A DOA.
APP2055 = FET version of APP2050.
APP10 = new low-noise DOA.
APP99F = new FET DOA.

I realize the APP99F is brand new. Could you post some spec's on that module if possible? How does the APP99F differ from the APP2055? How do they compare sonically? I believe I will want at least two of each of these in the near future. I will e-mail you Pier Paolo when I figure out what I need. Thanks, DANA.
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ------
Post by: ppa on February 18, 2010, 12:28:27 PM
thank you so much
Pier Paolo
Title: Re: APP2050 op amp ver.5 ---- APP2055 ver.1 (2050 FET ver.) ---- APP10 ver.2 ------
Post by: ppa on February 20, 2010, 07:59:27 AM
Excellent product development work going on at APP studio ing. I hope you don't mind if I re-cap your products briefly. I'm doing this mostly for myself.
APP2050 = standard, Class A DOA.
APP2050E = high Class A DOA.
APP2055 = FET version of APP2050.
APP10 = new low-noise DOA.
APP99F = new FET DOA.

I realize the APP99F is brand new. Could you post some spec's on that module if possible? How does the APP99F differ from the APP2055? How do they compare sonically? I believe I will want at least two of each of these in the near future. I will e-mail you Pier Paolo when I figure out what I need. Thanks, DANA.


the APP2055 it's an APP2050 fet version and it's also different from APP99F in circuitry and sound.
APP99F derives from the je-990 using FET in its front-end. Moreover, it's different from 990 also for its frequency compensation circuit. I use a "modern" and inedit frequency compensation circuit inside it, so APP99F has more stability than the original 990, than in the APP99F the RL network is no required in any case.

Regarding sound APP99F it's a bit different from je-990, even if many things are similar between them, because, in an op amp, the front-end is a thing important to give sound character. Currently I use 2sk170 fets (strong mached) in the APP99F. Its sound is much "airy" and a bit warm but very clear, moreover, like the other APP DOA's has very fast transients.

Currently, I'm trying to modify again the 99F from the original je-990 and for that I have not made in the market the 99F yet, even if , I precise, the current APP99F version is very good.  

 
 
  

  
Title: Re: NEW!! PSU BOARD -------- DOA'S APP2050, APP2055 , APP2050E.......
Post by: Tubemooley on February 23, 2010, 06:12:54 AM
Beautiful. That is EXACTLY what I wanted to know. As you said, the input transistors have a huge influence on the overall sound of any amplifier. Let me think about this new info here. Thanks Pier Paolo. DANA.
Title: Re: NEW!! PSU BOARD KIT -------- DOA'S APP2050, APP2055 , APP2050E.......
Post by: SALSA on February 27, 2010, 05:53:01 PM
Just ordered 2 PSU pcb's

Ciao  ;)

Mike
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE----- APP2050 , APP2055 .... DOA'S
Post by: tmuikku on March 01, 2010, 10:22:22 AM
Payment sent for PSU kit. Looking forward to get pieces together and start building PPA powered micpres :)
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE----- APP2050 , APP2055 .... DOA'S
Post by: lotus on March 02, 2010, 01:21:05 AM
Hi Pier I ordered 4 op amps to add to my other 2  and 1 of your new mic preamp psu kit,great intro price and the psu  looks to be high quality too! Thanks again
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIPPING
Post by: AudioHammer on March 08, 2010, 01:51:11 PM
Pier,

How is the development of the APP2050 GERMANIUM progressing? :)

Can you describe the sound of this DOA?

What will be the power supply requirements Voltage and current?

Thanks!
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIPPING
Post by: ppa on March 08, 2010, 07:20:41 PM
I have a prototype of 2050GE and I'm doing tests.

2050GE is a modern circuit opamp that uses old transistors, but the old germanium sound look is inside 2050ge.
It sound very warm with fast transients and high dynamic. There are a lot of harmonics in its sound.
Being a very low distortion opamp has not the distorted sound of old circuits.
The sound is totally different from a silicon bipolar transistors or fets input opamp, it's more similar to tube sound than silicon sound, but it has several different aspects of the tube sound as the type of warm and the very fast transients, the very big and fast basses. 2050ge is ideal for acoustic and electric guitars, the piano is fantastic, the voice is very warm and very real. 2050 ge opamps make very real many instruments, it's incredible.

regarding specifications:

input currents = - 2.2 uA typical
supply voltages = from +/- 12 V to  +/- 16V
max out current = 250 mA
quiescent current = +- 24 mA no load
input offset voltage= 5mV typical



thanks

Pier Paolo








 







    










 

Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIPPING
Post by: fluxivity on March 08, 2010, 07:56:59 PM
PM in re PSU kits
paul
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIPPING
Post by: ppa on March 09, 2010, 10:51:26 AM
mail with the total sent.

thanks
Pier Paolo
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIPPING
Post by: AudioHammer on March 09, 2010, 11:23:49 AM
>>>
>>>
2050GE is a modern circuit opamp that uses old transistors, but the old germanium sound look is inside 2050ge.
It sound very warm with fast transients and high dynamic. There are a lot of harmonics in its sound.
Being a very low distortion opamp has not the distorted sound of old circuits.
The sound is totally different from a silicon bipolar transistors or fets input opamp, it's more similar to tube sound than silicon sound, but it has several different aspects of the tube sound as the type of warm and the very fast transients, the very big and fast basses. 2050ge is ideal for acoustic and electric guitars, the piano is fantastic, the voice is very warm and very real. 2050 ge opamps make very real many instruments, it's incredible.
>>

I can't wait to try one out!   :D

Do you have an estimation of when you will begin selling the 2050GE?

Thanks!
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIPPING
Post by: SALSA on March 10, 2010, 02:00:13 PM
PSU boards arrived today !
Nice work, also good documentation provided.
Another useful building block for DIY

Thanks,
Mike
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIP
Post by: muffy1975 on March 10, 2010, 05:30:52 PM
HI,

can this PSU power the EZ1290 ( 1073 mic preamp ). It needs to see +24V.......OV ......and 48V.
Is this PSU similar to the JLM AC/DC PSU? Does it have a 0V rail?

If all is good, can you tell me your email so I can order one of your PSU kits!

Michael
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIP
Post by: muffy1975 on March 10, 2010, 08:01:00 PM
The EZ1290 needs to have 500ma for each mic pre amp
and I have two mic preamps.

I can't find your email address. Hope these PSU's are in stock

regards

Michael
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIPPING
Post by: ppa on March 11, 2010, 06:18:59 AM
Do you have an estimation of when you will begin selling the 2050GE?
Thanks!

I'm waiting the 2050GE pcb's so I think to have a stock avaiable in a month.
I've received one order and I could having other two 2050GE avaiable for the next week.

Pier Paolo 
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIPPING
Post by: ppa on March 11, 2010, 06:43:18 AM
PSU boards arrived today !
Nice work, also good documentation provided.
Another useful building block for DIY

Thanks,
Mike

thanks
Pier Paolo
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIP
Post by: ppa on March 11, 2010, 11:58:19 AM
The EZ1290 needs to have 500ma for each mic pre amp
and I have two mic preamps.

I can't find your email address. Hope these PSU's are in stock

regards

Michael
mail sent
I've in stock only 10 PSU yet.
thanks
regards
Pier Paolo
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIP
Post by: mik on March 11, 2010, 12:38:21 PM
Pier, I Just wanna thank you because your 2050 really rocks !  I've build a FFoptocompressor with those opamp as make up gain, and it sounds rally amazing, big neat sound !

I'have take some measurement with my lindos AL200 sistem, and I've discovered that they show the same distortion spec. expept at 1KHz : 990 has 0.007 and 2050 has 0.01% ( most second harmonic )  @ +6dbU,   

they show the same SN, -92.1 both powered with a common PSU +/-24

apart from this electrical issue, for gain FF opto comp. it is the best choice compared with 990, and 2520. no doubt about it.

I've compared the 2050 with a real API2520, in a 512 Mic pre also, and I have turn it in another  machine, really more clean and versatile tools..

really good Quality Price Ratio also ... It's worth a try !

thank you!

Mik.

 

 
 

Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIP
Post by: ppa on March 12, 2010, 12:22:17 PM

I'have take some measurement with my lindos AL200 sistem, and I've discovered that they show the same distortion spec. expept at 1KHz : 990 has 0.007 and 2050 has 0.01% ( most second harmonic )  @ +6dbU,   

Mik.


thank you very much,

it's important to note that APP2050 has a most second-order harmonic distortion, becuse this is the typical tube amp distortion.  Even if APP2050's THD is a tube-like distortion this THD is lower then in a typical tube amp, so the APP2050 THD is very difficult to listen.

Pier Paolo

Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIPPING
Post by: desol on March 12, 2010, 02:40:25 PM
How many amps is your power supply good for? 1 amp 2 amps?

Thanks
Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIPPING
Post by: ppa on March 12, 2010, 04:48:07 PM
How many amps is your power supply good for? 1 amp 2 amps?

Thanks

I have designed the power supply board for n.4   API312 channels but it can give power to 8 channels.

specs:
positive main out=  600mA
negative main out= 600mA
+48 out = 50 mA



thanks
Pier Paolo


Title: Re: NEW!! MIC PREAMP PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIPPING
Post by: ppa on March 17, 2010, 06:42:29 PM
APP99F (FET on input) modified , the first version was very good, this second is more good yet.
(I have modified the mirror of the original 990)

Now is in the market, I accept orders with a lead time of around 15 days.  

for the fisrt 10 customers the price is only 26 euros each one, S&H included with priority mail!

 
Title: Re: NEW!! APP99FET---PSU BOARD KIT, LAUNCH PRICE---DOA'S FREE PRIORITY MAIL SHIPPING
Post by: ppa on March 18, 2010, 05:13:59 PM
4 APP99F sold
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: [silent:arts] on March 22, 2010, 05:17:57 PM
two APP99F for me please ;D
might fit perfect to a project I'm currently working on ;)

since I'm missing them, will you send me out payment instructions?
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on March 22, 2010, 07:01:58 PM
Hi Volker,

yes 26x2= 54 euros payment for Europe to paypal [email protected]

thanks
Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: muffy1975 on March 23, 2010, 06:45:24 AM
Hey there,

I have just bought a PSU from your virtual shop for my EZ1290. I gather I will need to change a few of the caps but that this PSU will do the trick.

I will post when I have this PSU up and running and driving my wonderful EZ1290 mic pre amps.

Thanks for your kind and fast emails about the PSU compatibility with the EZ1290 etc

Michael de A

Ciao ;D
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: tmuikku on March 24, 2010, 01:24:58 AM
Hi Pier Paolo,

just paypalled for two APP2050. Thanks!

-T
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: mrvision on March 25, 2010, 07:58:46 PM
Pm'd about 2 APP99F.  :)
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: mrvision on March 25, 2010, 08:27:25 PM
Payment sent for 2 APP99F's  ;D
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: naths101 on April 06, 2010, 10:10:52 AM
Interested in the APP2050 germanium, do you have an ETA?
Cheers
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 06, 2010, 12:37:33 PM
Interested in the APP2050 germanium, do you have an ETA?
Cheers

Scuse me but what means ETA ?
tomorrow I will start with the assemblying of APP2050GE.

kind regards
Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: muffy1975 on April 06, 2010, 12:39:45 PM
Hi,

thankyou for my PSU. It's arrived today and looks wonderful.

I am using a 30va 25v transformer and I can't get the + rail down to 24V. The 48V rail is measuring 61V. Is this cos I'm in the UK?

How can I reduce these voltages? I have trimmed them as far back as possible with the trimmers!

Are there a few resistors I can change?

Many thanks

Michael
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 06, 2010, 02:02:59 PM
Hi,

thankyou for my PSU. It's arrived today and looks wonderful.

I am using a 30va 25v transformer and I can't get the + rail down to 24V. The 48V rail is measuring 61V. Is this cos I'm in the UK?

How can I reduce these voltages? I have trimmed them as far back as possible with the trimmers!

Are there a few resistors I can change?

Many thanks

Michael


your psu was modified from the original schematic to operate with the neve channels but it can work very fine with a fine trimmer setting. To set well it you should connect a load on the out that you have to fix. The +48V setting should be made with a 6.8k resistor on this out, or a 10k, 12k , 15k resitor. The same resistor can be used for the +24V. To test you can use the resistor used for the led to indicate the on state, it's easy to do: connect the LED- out to the out you have to setting, so for test the 48V out, connect the LED- out to +48V out and after set the voltage of this out at +48V.

 
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 06, 2010, 02:07:19 PM
Hi,

thankyou for my PSU. It's arrived today and looks wonderful.

I am using a 30va 25v transformer and I can't get the + rail down to 24V. The 48V rail is measuring 61V. Is this cos I'm in the UK?

How can I reduce these voltages? I have trimmed them as far back as possible with the trimmers!

Are there a few resistors I can change?

Many thanks

Michael


your psu was modified from the original schematic to operate with the neve channels but it can work very fine with a fine trimmer setting. To set well it you should connect a load on the out that you have to fix. The +48V setting should be made with a 6.8k resistor on this out. The same resistor can be used for the +24V.


However, the psu that I've modified to operate with neve preamps, worked very fine, so I think that there are no problems to fix your PSU. Can you send me a picture with the power trasformer connections?
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: muffy1975 on April 06, 2010, 04:11:10 PM
HI,

which power transformer did you use?

With both Ez1290s connected the + rail is 25V and the phantom power when on measures 52v at the psu.

here is a picture. The yellow and black are in the centre and the red goes to one side and the orange to the other.

Hope I can pad this voltage down :)

Michael
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 06, 2010, 04:19:40 PM
do not connect the AC power !!!!!!!!!!!!!!!!!!!!!!!!!!!!! danger !!!!!!!!!

THE AC FUSE IS NOT ISOLATED!!!!!!!!!!!!!!!!!!!!!!!!!!!!

DANGER!!!!!!!!!!!!!!!!!!!!!!!

THE PSU PCB IS NOT WELL ISOLATED, THE 4700uF CAP CAN EXPLODE!!!!!!!!!!!!
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: Sredna on April 06, 2010, 04:20:33 PM
Michael!

PLEASE, PLEASE, PLEASE!

Mount the fuse holder properly and isolate at least the high voltage cables better!

If the fuse holder comes loose, you´ll have 240V in the case and possibly through your
body as well....

Take care (I mean it),

Anders

Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 06, 2010, 04:23:14 PM
 Mount the fuse holder properly and isolate at least the high voltage cables better!
 do not connect the AC power !!!!!!!!!!!!!!!!!!!!!!!!!!!!! danger !!!!!!!!!

DANGER!!!!!!!!
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: muffy1975 on April 06, 2010, 04:41:30 PM
hey,

thanks for the warning guys!!! The PSU has two layers of electric tape underneath and a thin foam layer. The fuse holder is bolted down there's just no cover on in at the moment.

Back to the PSU. ;D How am I going to pad down the voltage?

Michael
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 06, 2010, 04:46:18 PM
hey,

thanks for the warning guys!!! Will redo this section.

Back to the PSU. ;D How am I going to pad down the voltage?

Michael

the dinner went me sideways for the fright.
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 06, 2010, 04:53:21 PM
hey,

thanks for the warning guys!!! The PSU has two layers of electric tape underneath and a thin foam layer. The fuse holder is bolted down there's just no cover on in at the moment.

Back to the PSU. ;D How am I going to pad down the voltage?

Michael

What's the voltage across the 4700uF cap's leads? You should measure it after all is well isolated! PLEASE!

 
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: muffy1975 on April 06, 2010, 04:57:19 PM
There is 43V DC across the legs of the 4700uf cap! Any good?

Michael
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 06, 2010, 05:31:08 PM
There is 43V DC across the legs of the 4700uf cap! Any good?

Michael

the trasformer could be bad connected. Could you send me the trasformer's datasheet by email? please.
There is 43V DC across the legs of the 4700uf cap also with the neve preamps connected?
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 06, 2010, 05:45:59 PM
if the power on led (the red led connected to LED- and LED+ outs of the PSU board) sheds light you can use the trimmer to set the +24V out for +24V even if there is 43V on the 4700uF cap.
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: muffy1975 on April 06, 2010, 05:48:51 PM
Hey,

the trimmer is fully turned and I get 25V! If I go the other way the voltage only increases. The Red LED lights up.

I have sent you the transformer data sheet, it's the 30va 25v model

Michael
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 06, 2010, 05:56:47 PM
I've received the datasheet and also cheched the trasformer's connections that're good.
At this point, what's the voltage across R4?
To fix the problem you can use an 4.7K 1/4W resistor for R3 and resetting the trimmer for 24V, I suspect that the LM317 used is a bit out of tollerance but it work well the same.
Have you 25V with the neve preamp on?

However the PSU runs, it is only that LM317 used is a bit out of tollerance and the AC voltage is high.
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: muffy1975 on April 06, 2010, 06:04:15 PM
The Neve's are both receiving 25V

I have 1.3v DC with my probes either side of the resistor R4
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: muffy1975 on April 06, 2010, 06:07:05 PM
Cool Cool,

will try changing to 4.7k for R3

Will let you know what happens 8)

Thanks for your help my man ;D
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 06, 2010, 06:11:20 PM
I suppose fine, is the LM317 out of tollerance but works fine the same. If you change R3 with a 4.7kohm you can set the trimmer for +24V.

The LM317 heatsink I suspect that's a bit hot, isn't it?

Pay Attention to the heatsink temperature.
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: muffy1975 on April 06, 2010, 06:49:14 PM
Yeah the LM317 is hot. :o

But i have 24V ;D So that's now very good

The +48v is reading 60V when not beng used, and when being used with a microphone is measuring 48V Is that correct?

Michael

Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: naths101 on April 06, 2010, 09:26:32 PM
Interested in the APP2050 germanium, do you have an ETA?
Cheers

Scuse me but what means ETA ?



sorry, 'estimated time of arrival'... that is when will they be available?
thanks
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 07, 2010, 06:01:17 AM
Yeah the LM317 is hot. :o

But i have 24V ;D So that's now very good

The +48v is reading 60V when not beng used, and when being used with a microphone is measuring 48V Is that correct?

Michael



You are using a trasformer for 230V AC input, you are in UK so the AC voltage is 240V , moreover,  probably, this one is more than 240V because in many countries the effective voltage is highter than the nominal.
Moreover, you are using a trasformer with 25V secondaries for 24V DC on PSU's out, and, there are the trasformer's tollerance too, so, at this point, there is an high voltage across the LM317, but it's not a real problem, but an high voltage gives high power to dissipate. I have designed the heatsink for less voltage across the LM317 for a good temperature margin (85°C with 40°C of ambient) becuse the normal conditions are others than yours.
For your PSU currently conditions I've calculated an LM317's internal temperature near to 85°C with 25°C of ambient temperature , but since the PSU will go inside a chassis that will go inside a rack we should consider 35-40°C of ambient temperature instead of 25°C, so the LM317's internal temperature might be near to 100°C in a rack. The LM317 limit temperature is 125°C. At at this point I council a bigger heatsink than those is now mounted.


Rearding the phantom power the mic never sees 60V but only +48V , but to avoid to have 60V on this out you can solder a resistor of 15K 1/2W between GND and the phantom out.

Pier Paolo

  

Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 07, 2010, 07:36:30 AM
Interested in the APP2050 germanium, do you have an ETA?
Cheers

Scuse me but what means ETA ?




sorry, 'estimated time of arrival'... that is when will they be available?
thanks

the lead time is around a week.
the shipping time for Australia is around often one week or two max.

Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: muffy1975 on April 07, 2010, 08:26:23 AM
Ok,

please don't be angry with me.....but my volt meter is/was  wrong. I Checked the mains voltage and it said 250V....???? So my meter needed a new battery. Now the mains reads 240V

I have reset everything, put the pSU back as was before...I believe R3 was 5.6K right?

YOUR PSU RULES AND IS NICE AND CLEAN and the Voltages are spot on. The heatsink is not too hot.

Thankyou so much for your product

Michael

and sorry for running up a whole page of your thread with my dodgy volt meter ;)
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 08, 2010, 01:31:00 AM
thanks for the compliments,

yes the original R3 resistor is 5.6k

don't worry for the time, it's important that the PSU was modified to run for neve preamps.

Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: dingo on April 15, 2010, 12:14:11 PM
hello!! Pierpaolo!!
just finisched my 312 pre with your  2050 and 2050e
tested in studio session on drum,guitars and bass ....SOUNDS FANTASTIC!!!!
wery clean ,super fast  transient on snare  and kick ,huge on guitars !!
working with 18 V  will try 24v
much better comparated to my api512c!!!!
will try on passive eq like pultec.... and passive summing buss
good job!!! :) :)
thank you!!
dingo.
Title: Re: NEW!! APP99F (990FET version) in the market -- APP2050 new prices!
Post by: ppa on April 16, 2010, 03:59:41 PM
thanks very much


Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: mrc on April 19, 2010, 01:07:45 AM
I'd like four DOA's, I've sent a pm.
mrc
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: bplastic77 on April 19, 2010, 02:27:48 PM
Hey Pier Paolo,
I would like to order 2 APP99F's
thanks
Brian :)
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on April 19, 2010, 05:20:29 PM
Hey Pier Paolo,
I would like to order 2 APP99F's
thanks
Brian :)
Hi Brian,
2X APP99F are 2X26 Euros = 52 euros = 70.3 US $ ,   S&H and paypal fees are included in the price.
It's possible paying in US $. The paypal payment for no european customer is to [email protected], for european customer is [email protected] (It's for the strange italian fiscal laws)   
k regards
Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on April 19, 2010, 05:58:42 PM
a power amp that I'm developing
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: mrc on April 20, 2010, 07:34:02 PM
Hi,
Payment sent for 2 x APP 99F and 2 x 2050 GE ;D
Thanks,
Mike
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on May 16, 2010, 09:47:31 AM
thanks
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on May 16, 2010, 09:49:43 AM
the prototype amp under testing , it's a 250W/4 ohm amp.
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on May 16, 2010, 09:59:41 AM
pre mic with new topology (not 312) , it's a prototype so the silkscreen it's absent.
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: Govinda Doyle on May 19, 2010, 10:11:14 PM
When will the germainium op amps be ready?
what voltage do they run?
And what is the sound like compared to your other op amps?
Cheers
Govinda
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: bobine on May 19, 2010, 10:29:01 PM
+1 eagerly awaiting the germanium
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on May 20, 2010, 02:40:09 PM
When will the germainium op amps be ready?
what voltage do they run?
And what is the sound like compared to your other op amps?
Cheers
Govinda
thanks for the interest,
I've sold on pre-selling several germanium opamp to my old customers on these days.
It's ready.
APP2050Ge runs with supply voltages in range +/-12V to +/-16V.
It's hard to describe the germanium sound, but I can write that it has the typical color of the old germanium gears but with high dynamic and the modern sensation of low distortion (infact it has low distortion). It has a very warm sound with high definition.

My others opamps sound different between them.

kind regards
Pier Paolo



 
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on May 20, 2010, 02:41:16 PM
+1 eagerly awaiting the germanium
I can make it in fast time.
kind regards
Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: mik on May 20, 2010, 03:48:41 PM
I've recived my 2055 today.. very nice package, thank you!

Mik.
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: Govinda Doyle on May 20, 2010, 07:59:23 PM
When will the germainium op amps be ready?
what voltage do they run?
And what is the sound like compared to your other op amps?
Cheers
Govinda
thanks for the interest,
I've sold on pre-selling several germanium opamp to my old customers on these days.
It's ready.
APP2050Ge runs with supply voltages in range +/-12V to +/-16V.
It's hard to describe the germanium sound, but I can write that it has the typical color of the old germanium gears but with high dynamic and the modern sensation of low distortion (infact it has low distortion). It has a very warm sound with high definition.

My others opamps sound different between them.

kind regards
Pier Paolo



 

dang! I was hoping to use the germanium with a +- 24volt rail, i want an op amp that has the smoothest high mids clear but warm what would you recommend? once i find one i like i will be ordering about 32 or 64!
Thanks so much for the speedy reply!
Govinda
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on May 21, 2010, 11:00:26 AM
It's the APP2050 , that has clear and warm sound with a 60-70' vintage color, it runs at +/-24V of supply voltages. Moreover, it has very fast transients and dynamic (infact it's very indicated with guitars).

If you want a clear and trasparent sound (but no aggressive), I council you the APP2055.

Regarding the APP2050Ge I could use higher voltage transistors to run with +/- 24V, but I think that the right op amp for your application is the APP2050 normal or E version.

Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: dingo on May 27, 2010, 05:11:27 AM
hello pierpaolo!
payment done for: n2 2050E,n2 2050ge,n1 psu kit
(ID univoco della transazione 7BT65006S11552933)
 ;)
thankyou!!
dingo.
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on May 27, 2010, 01:04:38 PM
thanks
I will send these ones soon.
Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: Govinda Doyle on June 24, 2010, 02:41:07 AM
It's the APP2050 , that has clear and warm sound with a 60-70' vintage color, it runs at +/-24V of supply voltages. Moreover, it has very fast transients and dynamic (infact it's very indicated with guitars).

If you want a clear and trasparent sound (but no aggressive), I council you the APP2055.

Regarding the APP2050Ge I could use higher voltage transistors to run with +/- 24V, but I think that the right op amp for your application is the APP2050 normal or E version.

Pier Paolo

So what is the tone difference between the 2050 E version and 2050?
The console im replacing op amps is a yamaha pm2000 the op amps in it are really in your face which i love but there is this 4k edge i wanna get rid of i have tried other op amps but others like jlm99v sounded more distant and not as strong phase as the yamaha op amps!
thanks again
Govinda
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: mrc on June 24, 2010, 04:33:48 PM
Pier Paolo,
I just got the package in the mail a few minutes ago.  Thank you very much, I can't wait to listen to them 8)
Mike
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on June 24, 2010, 04:39:50 PM
Pier Paolo,
I just got the package in the mail a few minutes ago.  Thank you very much, I can't wait to listen to them 8)
Mike
thanks
Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on June 24, 2010, 04:49:22 PM
So what is the tone difference between the 2050 E version and 2050?
The console im replacing op amps is a yamaha pm2000 the op amps in it are really in your face which i love but there is this 4k edge i wanna get rid of i have tried other op amps but others like jlm99v sounded more distant and not as strong phase as the yamaha op amps!
thanks again
Govinda



APP2050E is better than APP2050 for many things.
However, if you need 32 or 64 pcs, I could send you some differents opamps so you could decide that fits better into your console. This is the process I do when the customer needs to replace several opamps in his console. The opamps that you don't choise, you could send back them to me for others of the type that fits better into your console. Moreover I do a special price for large quantity.
Pier Paolo







Title: Re: NEW!! APP99F (990FET version) in the market
Post by: Govinda Doyle on June 24, 2010, 11:09:46 PM
Thanks Pier!
only thing is they have to be soldered into my console, i'm a really neat solderer but im not sure if you will want them back after they have been fixed in my console
do you think if i get say 2x2050 and 2x2050e will that be enough for me to try?
is it worth me trying the 990 style as well?
Thanks again
Govinda
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on June 26, 2010, 07:44:53 AM
Thanks Pier!
only thing is they have to be soldered into my console, i'm a really neat solderer but im not sure if you will want them back after they have been fixed in my console
do you think if i get say 2x2050 and 2x2050e will that be enough for me to try?
is it worth me trying the 990 style as well?
Thanks again
Govinda
I could send you the opamps with solderable leads , the "normal" pins have not be soldered.
Regarding the return back of the samples, do not worry! If you will buy the stock of opamps for your console I will return to you the money the same for the samples that you do not need. However, regarding for the samples I do a special price for them.
Moreover, for free, I could send you a new version of my APP99 (that it will have different name) to test it on your console.
Pier Paolo
  

 


 


  
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: strangeandbouncy on June 29, 2010, 07:23:56 PM
Hi Pier,


   want to build a stepped mastering version of Studer 169-500, hf and lf only, with switchable frequencies. Would you recommend APP10 or APP99F? - not looking for character, just transparency and speed.


     kindest regards,


       AndyP
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: mikefatom on June 29, 2010, 08:32:17 PM
Email sent!

thanks

Mike
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on June 30, 2010, 01:08:31 PM
Hi Pier,


   want to build a stepped mastering version of Studer 169-500, hf and lf only, with switchable frequencies. Would you recommend APP10 or APP99F? - not looking for character, just transparency and speed.


     kindest regards,


       AndyP

for an eq I council the APP2055 because you can have the trasparency and the speed of the APP10 but, in eqs, the APP2055 is better than APP10 for noise. The APP99F has not the trasparency and speed of the APP2055 in eqs.

kr
Pier Paolo



 





   


Title: Re: NEW!! APP99F (990FET version) in the market
Post by: mikefatom on June 30, 2010, 05:36:12 PM
Thanks for the invoice Pier! It's all paid! I appreciate the little extra touch :)

cheers

mike
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on July 02, 2010, 10:15:32 AM
for an eq I council the APP2055 because you can have the trasparency and the speed of the APP10 but, in eqs, the APP2055 is better than APP10 for noise. The APP99F has not the trasparency and speed of the APP2055 in eqs.
kr
Pier Paolo

I wanted to say that APP2055 is an ultra low noise opamp. It has 10 times less voltage noise than an OPA604, for example. APP2055 has the advantage to have an ultra low voltage noise of (1nV/rt hz at 1khz) and an ultra low current noise, so, in an eq, it give a noise so low that it's very hard for an IC and a discrete opamp to do better.  Moreover, APP2055 has a wonderful stability at unity gain and an high slew rate so it's very indicated for active filters. APP10 gives very low noise in an gear such an eq but APP2055 does better. Moreover, for lowest gains I prefer the APP2055 to the APP10 and also to many opamps, because APP2055 gives an impressive low noise in this gear as the studer eq.

However, APP10 it's very indicated for trasformerless preamps and for input trasformer preamps with input trasformer ratio in range from 1:1 to 1:5, but works very well in line amplifiers, compressors, active summing amps , eqs, so APP10 works very well in the studer eq, but since you have asked to me a council I had give it to you.  :D


kr
Pier Paolo

  
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: diyfanatic on July 05, 2010, 07:51:28 AM
Hi Pier Paolo

I would like to order 2 APP99F's, could you please tell me how much I need to pay since I don't really understand if the discount is on the shipping or on the DOA itself! (sorry I'm french!!!)

Quote
Price is 32 euros, S&H with registered mail service with 50% of discount.

Grazié millé!
Jr.
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: Sredna on July 05, 2010, 11:51:50 AM
Package arrived safe and sound(!) ;D

Thanks a lot,

Anders
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on July 05, 2010, 06:33:23 PM
Hi Pier Paolo

I would like to order 2 APP99F's, could you please tell me how much I need to pay since I don't really understand if the discount is on the shipping or on the DOA itself! (sorry I'm french!!!)

Quote
Price is 32 euros, S&H with registered mail service with 50% of discount.

Grazié millé!
Jr.

Hi,
the discount is on the shipping.
For France the registered mail service is 7 euros so, with the discount applied, the shipping cost is 3.5 euros.
thanks
kind regards
Pier Paolo

 
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: diyfanatic on July 06, 2010, 03:30:47 AM
Hi Pier Paolo,

on the first page the price is 32€ so it should be 64€ + 3,5€ for shipping = 67,5€ right?
on the same time, you wrote this for a customer, maybe there was a special discount at this time!

don't want to be a pain but I'm a bit lost here...

Hey Pier Paolo,
I would like to order 2 APP99F's
thanks
Brian :)
Hi Brian,
2X APP99F are 2X26 Euros = 52 euros = 70.3 US $ ,   S&H and paypal fees are included in the price.
It's possible paying in US $. The paypal payment for no european customer is to [email protected], for european customer is [email protected] (It's for the strange italian fiscal laws)   
k regards
Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on July 06, 2010, 01:58:30 PM
I done a lunch price for the APP99F at 26 euros pc, but now the prices is 32 euros pc.

Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: diyfanatic on July 06, 2010, 04:56:11 PM
thanks that's what I tought !  ;)

finally I took 2 APP2050, promise I'm not cheap just changing my mind after some readings!

so payed for 2 APP2050!

thanks to offering this, I've read nothing but good things about your DOA!

cheers.
Jr.
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: indigom on July 08, 2010, 04:13:21 PM
Thanks Pier,

 Got the 5 various DOAs this week...APP2050,2 x APP99F,APP99, APP10 to compliment the 2055s from the previous order.

 I am looking forward to listening getting them in the mix.. but my 8 channel 'test jig' is  tore apart at the moment because it is awaiting DC power from the GDIY51X PSU still being built.   see attached image.

Life takes its own time when there is housework and the job to keep up on!


Cheers~
Jay
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on July 14, 2010, 12:18:45 PM
nice pic,
thanks
Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on July 14, 2010, 12:22:27 PM
my 10 leds meter , soon in the market , it's a prototype only, that for sale has labels and solder

it goes from -15dbu to +12dbu
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: indigom on July 14, 2010, 03:36:47 PM
my 10 leds meter , soon in the market , it's a prototype only, that for sale has labels and solder

it goes from -15dbu to +12dbu

Pier, Is this PCB using the LM3914 ?

Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on July 14, 2010, 03:40:46 PM
my 10 leds meter , soon in the market , it's a prototype only, that for sale has labels and solder

it goes from -15dbu to +12dbu

Pier, Is this PCB using the LM3914 ?



it's the 3915


Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on August 07, 2010, 02:17:38 PM
this is a sound track from a fivefish X12 with two APP2050's ver.5.2 inside (now there is the Ver.6.0)



(http://home.teletu.it/APPSI/APP2050%20inside%20fivefish.JPG)



http://home.teletu.it/APPSI/app2050%20inside%20fivefish.mp3



sounds a pork pie captured by two neumann u87

this file was sent to me from an italian recording studio (Acusticstudio)

special thanks to Emiliano Margiotto

NOTE:It is important to say that the fivefish X-12 is an hybrid pre, so the front-end stage is with the APP2050 and the second and 3th stage are with IC's, than x-12 is not a pure discrete path and the sound of the APP2050 sounds different than in a pure discrete pre as, for example, the VP312 of Jeff Steiger to be clear. Some of my customers have emailed me to tell me this difference in sound look.


   
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: diyfanatic on August 09, 2010, 03:09:01 PM
Hi Pier Paolo,

still got nothing!
2 APP2050 ordered 6th july.

cheers.
Jr.
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on August 09, 2010, 05:07:15 PM
Hi

the opamps  were sent with poste italiane using registered mail: tracking number RA240993177IT

scuse me I've forgotten to send you a message

Pier Paolo
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: diyfanatic on August 10, 2010, 04:45:13 AM
thanks Pier Paolo, I'll look into it!
I'll let you know.
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: diyfanatic on August 10, 2010, 09:26:21 AM
hummm,

message from the Poste Italiane:
"Il codice inserito non é valido"

I was in Firenze 2 weeks ago by the way, beautifull country, espacially Sienna!

cheers.
Jr.
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on August 10, 2010, 01:11:54 PM
this is my try on the poste italiane's web site.
the tracking number is valid , but it's a bit difficult use it.
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on August 10, 2010, 01:16:17 PM
like is possible reading on the poste italiane's page the parcel is in Rome so it is going to France.
The problem is that the page is in italian language and the tracking service shows only the parcel's path in Italy and not in France but, I think, should be possible using this tracking number with the french post successfully.  

I think it should be out of Italy tomorrow, and however I don't think there are problems with the shipping, there is a bit of delay time given by fact that several people is in holiday. ;)

I've forgotten to tell you that there was a delay time from me given by the fact that these DOA's are just the first 2 pcs of 2050 made in the new version (6.0 version), the APP2050 are very improved in this new version.
This is the true reason of the delay time. I've sold several other ver.6 2050 opamps but the first two were for you.
I've avoided to send you two APP2050 previus version I had (in theory these two should be sent to you).  
My goal is the customer satifaction with the quality, I don't do much marketing , infact, I have a bad web site and no adversiting. There are companies that do a lot of marketing but in this place I prefer only making excuse for the delay time.  :)
  
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: diyfanatic on August 10, 2010, 02:04:29 PM
no problem here PPA, my concern was more about the french postal service!  :D
thanks for the new improved version, I'll make good use of them in my pultec amp!!

I let you know when they arrived...
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on August 16, 2010, 02:57:04 PM

(http://home.teletu.it/APPSI/finale%20amp%20022.jpg)
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: mikefatom on August 16, 2010, 03:00:32 PM
oooohhh!.... power amp? looks beefy!  ;D
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on August 16, 2010, 03:03:49 PM
this is the APP1025 an power amp with 250W of max power on 4 ohm load

it uses mosfets on out, full complementary circuit, low overall feedback

moreover it has current feedback (http://home.teletu.it/APPSI/finale%20amp%20028.jpg)
Title: Re: NEW!! APP99F (990FET version) in the market
Post by: ppa on August 16, 2010, 04:55:33 PM
(http://home.teletu.it/APPSI/finale%20amp%20014.jpg)
Title: Re: APP discreet op amps
Post by: funkymonksf on August 16, 2010, 09:33:30 PM
Hello,

Are you familiar with JLM's baby animal? I was pondering throwing a few of them together and using your lovely DOA's in them. Anyone who's had experience with the two could you recommend a model for me. Looking for thick and colored but no mud. something that'll pair with a C-12 tube mic clone. Thinking classic boss nova 60's recording flavor
Title: Re: APP discreet op amps
Post by: ppa on August 17, 2010, 03:59:40 AM
Hi,

several my customers use my opamps inside JLM baby animal pres, one of my customer (in Paris) has 22 my opamps inside JLM pres, he use several APP2050 and APP10. The APP2050 has the sound look you need, especially in the JLM baby animal that has a modern sound, APP10 is much more neutral.
Title: Re: APP discreet op amps
Post by: mikefatom on August 19, 2010, 07:02:00 PM
Hello Pier,

I received the DOAs today! Thank you very much!
They are the sexiest little black boxes I've ever seen...  ;) ;D :D

Unfortunately, I won't really have a chance to thoroughly test them out until I come back from vacation.  :(

Cheers,

Mike
Title: Re: APP discreet op amps
Post by: diyfanatic on August 20, 2010, 01:10:10 PM
hey Pier Paolo!

two 2050 arrived safely to their new home.
just wainting a last order and I'll test them in my pultec.

thanks.
Jr.
Title: Re: APP discreet op amps
Post by: ppa on August 26, 2010, 01:04:28 PM
new preamp

this is not a 312 or neve clone, it's a totally new preamp using silicium and germanium DOA's


(http://home.teletu.it/APPSI/pre%20APP1028.JPG)


this is a prototype , than it has not labels and one channel and I am waiting the knob , it is waiting to be sent out to a studio for tests.

Title: Re: APP discreet op amps
Post by: shabtek on August 26, 2010, 02:10:42 PM
big box, small circuit?
51x?
Title: Re: APP discreet op amps
Post by: ppa on August 26, 2010, 06:29:29 PM
the box is big because it is for four channels as an API3124, but it is two times more complex than the 3124 so isn't so small. Yes, it's 51x compatible, moreover, each channels can have the out trasformer configured for 1:2 or 1:1.
I'm going to post the photo of the internal.
I'm developing the 51x version.

 
Title: Re: APP discreet op amps
Post by: ppa on August 28, 2010, 03:17:32 PM
this is the preamp module (one channel)

please note that's ONLY a PROTOTYPE! thank you



(http://home.teletu.it/APPSI/pre%20app1040%20module%20+%20meter2.JPG)

it has inedit topology , not all world is 312 or Neve clones!

it has only 32dBu out ,

the DI input is connected directly to the + in of the DOA.
I've designed this topology to play the instruments directly connected to APP2050GE germanium DOA , to avoid to hear
the sound of a DI or a transformer.
 


Title: Re: APP discreet op amps
Post by: ppa on August 28, 2010, 04:43:39 PM
(http://home.teletu.it/APPSI/pre%20app1040%20module%20+%20meter2%20%202th.JPG)
Title: Re: APP discreet op amps
Post by: seavote on September 04, 2010, 11:01:50 AM
what power transformer are you guys (us, canada) using for piers power supply? i'd like to use a small torroidal. any suggestions?
 

Title: Re: APP discreet op amps
Post by: Ryake on September 04, 2010, 01:09:21 PM
Received my two Germanium DOA's, Thanks Pier!

Ryan
Title: Re: APP discreet op amps
Post by: ppa on September 04, 2010, 01:23:59 PM
Received my two Germanium DOA's, Thanks Pier!

Ryan

thanks Ryan for having considered my opamps!
I would like to council you to use the APP2050E inside the Peter's eq and the APP2050GE inside preamps, because for preamps the 2050 germanium is very special.
Title: Re: APP discreet op amps
Post by: ppa on September 04, 2010, 01:41:33 PM
what power transformer are you guys (us, canada) using for piers power supply? i'd like to use a small torroidal. any suggestions?
 



the power of the trasformer depends of its charge, than of the sum of the quiescent current of the channels supplied and the max out currents on 600 ohm of these channels. I've designed this PSU for 4  312 channels max, so

for 2   312 channels I council you a 15VA power trasformer and for 4 312 channels a 25VA or 30VA power trasformer   

 
Title: Re: APP discreet op amps
Post by: Winetree on September 04, 2010, 03:29:05 PM
reading the post, is the 2050GE available now?
Title: Re: APP discreet op amps
Post by: ppa on September 04, 2010, 03:52:52 PM
I've sold 35   2050 germanium's in these months on pre-sale to see if it would have works well.
Since it sounded very well I am replacing a little stock of them, because I am developing my new mic preamp with transformers and an inedit topology trasformerless pre.
If there is a good request of this type of opamp I am happy to make a big stock of them.  
Title: Re: APP discreet op amps
Post by: seavote on September 04, 2010, 10:02:26 PM
pier, i  populated my PSU board a long while ago then moved on to populating two others pcbs for my project. i'd like to order  the power transformer for my m1 type build. i dont have the schematic or other info with me and wont have access to it till tuesday. could you tell me the 2 voltagesi want coming from the power tranny to inputs 1 and 2??
thanks  chris vought  (seavote)
Title: Re: APP discreet op amps
Post by: ppa on September 05, 2010, 06:40:10 AM
pier, i  populated my PSU board a long while ago then moved on to populating two others pcbs for my project. i'd like to order  the power transformer for my m1 type build. i dont have the schematic or other info with me and wont have access to it till tuesday. could you tell me the 2 voltagesi want coming from the power tranny to inputs 1 and 2??
thanks  chris vought  (seavote)

for 2X   M1 channels (without meters) the power trasformer is 15VA  25+25V , so two secondaries of 25V each (or 24V each).

for 4X   M1 channels (without meters) the power trasformer is 25VA  or (30VA) 25+25V (or 24+24V) , so two secondaries of 25V each (or 24V each). 
 


Title: Re: APP discreet op amps
Post by: Ryake on September 05, 2010, 07:33:25 AM
Received my two Germanium DOA's, Thanks Pier!

Ryan

thanks Ryan for having considered my opamps!
I would like to council you to use the APP2050E inside the Peter's eq and the APP2050GE inside preamps, because for preamps the 2050 germanium is very special.

Will Do! Thanks again
Title: Re: APP discreet op amps
Post by: seavote on September 05, 2010, 01:36:05 PM
thanks pier. was pretty sure the 24V was ok for the =/- 24v but didnot know what was a good voltage to regulate to 15V
thanks
Title: Re: APP discreet op amps
Post by: ppa on September 05, 2010, 01:46:44 PM
thanks pier. was pretty sure the 24V was ok for the =/- 24v but didnot know what was a good voltage to regulate to 15V
thanks

it is 15+15V.
If you have other questions, please contact me.
regs
Pier Paolo
Title: Re: APP discreet op amps
Post by: mrcase on September 07, 2010, 12:41:44 PM
hi!

I´d like to order one APP2050E. whats your paypal address?

cheers,
martin
Title: Re: APP discreet op amps
Post by: ppa on September 08, 2010, 07:56:23 AM
hi!

I´d like to order one APP2050E. whats your paypal address?

cheers,
martin
Martin I am going to check if I have one available because I have had several orders in this months and I'm replecing the stock. However, if I have not any APP2050E available to go out now , if you want, I can send you an message or email, when it is ready to go out.
cheers
Pier Paolo
 

Title: Re: APP discreet op amps
Post by: tmuikku on September 08, 2010, 08:00:00 AM
I finally tested APP2050 in 312 circuit. Sounds great! Will order even more in the future ;) Thanks for great service and very affordable prices!
Title: Re: APP discreet op amps
Post by: mrcase on September 08, 2010, 04:45:12 PM
hi pier!

sounds good! I also might be interested in the 2055 or 2050. do have those in stock? it´s for an api312.
but actually I´m in no hurry :-)
Title: Re: APP discreet op amps
Post by: ppa on September 09, 2010, 01:13:02 PM
I will check, however the new stock are caming soon.
Title: Re: APP discreet op amps
Post by: Tweekhead on September 10, 2010, 12:01:45 PM
Hello!

I'd like to order 2 of the APP2050 GERMANIUM if possible.

Thanks!

Arthur
Title: Re: APP discreet op amps
Post by: pacemaker on September 16, 2010, 05:18:22 AM
Hi Paolo,
i would like to order 6 APP2050
shipped to France with standard shipping,
can you send me a paypal invoice at
pacemaker ( dot ) 3 ( at ) wanadoo ( dot ) fr  please ?
best regards,
Francois
Title: Re: APP discreet op amps
Post by: ppa on September 16, 2010, 05:46:09 PM
Hi Paolo,
i would like to order 6 APP2050
shipped to France with standard shipping,
can you send me a paypal invoice at
pacemaker ( dot ) 3 ( at ) wanadoo ( dot ) fr  please ?
best regards,
Francois
done
thanks
best regards
Pier Paolo
Title: Re: APP discreet op amps
Post by: pacemaker on September 17, 2010, 03:47:39 AM
payment just sent !
thanks !
Title: Re: APP discreet op amps
Post by: mrcase on September 18, 2010, 05:49:02 AM
hey pier!

can you send me an paypal invoice for one APP2050E and one APP2055 (shipping to austria) to martin.mitterstieler(at)gmail.com ?

all the best,
martin
Title: Re: APP discreet op amps
Post by: ppa on September 18, 2010, 05:53:27 AM
of course
thanks
best regards
Pier Paolo
Title: Re: APP discreet op amps
Post by: ppa on September 18, 2010, 07:26:32 AM
done
thanks
best regards
Pier Paolo
Title: Re: APP discreet op amps
Post by: mrcase on September 18, 2010, 11:11:31 AM
and payed!
thanks a lot!
best regards,
martin
Title: Re: APP discreet op amps
Post by: Tweekhead on September 23, 2010, 10:49:07 AM
Pier,

I was just wondering what the status was for the two APP2050 GERMANIUM DOA?
Could you send me a Paypal invoice when they are available?

Thanks!

phaudio (at) hotmail (dot) com

I tried to PM you, but your message box is full :)
Title: Re: APP discreet op amps
Post by: ppa on September 23, 2010, 02:02:25 PM
of course

thanks
best regards
Pier Paolo
Title: Re: APP discreet op amps
Post by: Tweekhead on September 25, 2010, 12:44:05 PM
Payment sent!

Thanks again,

Arthur
Title: Re: APP discreet op amps
Post by: pacemaker on October 01, 2010, 02:36:36 PM
Hi Paolo,
did you get time to build and ship my opamps ?
regards,
Francois
Title: PSU2 question
Post by: seavote on October 01, 2010, 04:56:54 PM
when i powered up my PSU2 c19 and 20 fried.  found that electrolytic c14 was backwards. i"ll replace C19 and 20. does backwards c14 sound like the probable cause?  are there other components that would (could have) likly have suffered damages? thanks
Title: Re: APP discreet op amps
Post by: ppa on October 01, 2010, 05:20:15 PM
yes, c14 made a shortcircuit and c20 and c19 fried for this reason, the only component stressed was b2, for the other components there are no problems! However, B2 was stressed not broken.  ;)

Title: Re: APP discreet op amps
Post by: ppa on October 01, 2010, 05:28:02 PM
Hi Paolo,
did you get time to build and ship my opamps ?
regards,
Francois

opssss ......I am making them  ,........yet.........  ::)  ::)
Title: Re: APP discreet op amps
Post by: mrcase on October 02, 2010, 07:41:30 AM
Hi Paolo,
did you get time to build and ship my opamps ?
regards,
Francois

opssss ......I am making them  ,........yet.........  ::)  ::)

same with me I guess! ;-)

best,
martin
Title: Re: APP discreet op amps
Post by: jwk1 on October 02, 2010, 09:55:00 AM
Hi,

I'm interested in two germanium DOA's, if it's possible to place a pre-order. 

Thanks,

Josh
Title: Re: APP discreet op amps
Post by: ppa on October 03, 2010, 07:16:18 AM
Hi Paolo,
did you get time to build and ship my opamps ?
regards,
Francois

opssss ......I am making them  ,........yet.........  ::)  ::)

same with me I guess! ;-)




best,
martin

your opamps are quasi assembled
thanks
best regars

Pier Paolo
Title: Re: APP discreet op amps
Post by: ppa on October 03, 2010, 05:57:24 PM
Hi,

I'm interested in two germanium DOA's, if it's possible to place a pre-order. 

Thanks,

Josh

pm sent
thanks
best regards
Title: Re: APP discreet op amps
Post by: pacemaker on October 12, 2010, 05:36:00 AM
Hi Paolo,
any news about my opamps ?
It's been near one month now
and my 2-ACA are starving without his opamps ! ;-)
please keep me informed,
regards,
francois
Title: Re: APP discreet op amps
Post by: pacemaker on October 19, 2010, 08:10:50 PM
Hi Pier Paolo
hope everything is ok for you,
i haven't received the opmaps yet,
it would be really great having a few news 
Regards,
francois
Title: Re: APP discreet op amps
Post by: ppa on October 20, 2010, 06:51:28 AM
opamps ready to go out.
thanks
regards
Pier Paolo
Title: Re: APP discreet op amps
Post by: baadc0de on October 20, 2010, 10:36:08 AM
Paid for opamps & power board yesterday.
Title: Re: APP discreet op amps
Post by: pacemaker on October 20, 2010, 01:27:07 PM
coooool !!!
thank you  very much !
can't wait to listen to your opamps in jeff's 2-ACA summing section !
Regards,
Francois
Title: Re: APP discreet op amps
Post by: mrcase on October 28, 2010, 11:50:52 AM
any news on my DOAs?

regards, martin
Title: Re: APP discreet op amps
Post by: ppa on October 28, 2010, 11:58:42 AM
any news on my DOAs?

regards, martin
sent
Title: Re: APP discreet op amps
Post by: ppa on October 28, 2010, 05:35:11 PM
coooool !!!
thank you  very much !
can't wait to listen to your opamps in jeff's 2-ACA summing section !
Regards,
Francois

parcel sent
Title: Re: APP discreet op amps
Post by: pacemaker on October 29, 2010, 04:36:20 AM
ooops
i though you sent them one week ago
I will have to patient  !!
Regards,
Francois
Title: Re: APP discreet op amps
Post by: mrcase on November 03, 2010, 04:26:27 PM
Hi pier!

received your DOAs! looking great, thank you!
I gonna try them in my api312s the next days!

cheers, martin
Title: Re: APP discreet op amps
Post by: Tweekhead on November 10, 2010, 01:17:32 PM
Pier,

I apologize in advance, but I have a limited time to dispute charges for items I've paid for and have not received, so today I was forced to file a dispute with Paypal.

I Paid for 2 APP2050 GERMANIUM DOAs on September 26th and still have not received them. 

I tried to send this message to your inbox, but it was full.

Arthur Kaprelian
phaudio (at) hotmail (dot) com
Title: Re: APP discreet op amps
Post by: ppa on November 10, 2010, 03:54:36 PM
Pier,

I apologize in advance, but I have a limited time to dispute charges for items I've paid for and have not received, so today I was forced to file a dispute with Paypal.

I Paid for 2 APP2050 GERMANIUM DOAs on September 26th and still have not received them. 

I tried to send this message to your inbox, but it was full.

Arthur Kaprelian
phaudio (at) hotmail (dot) com

Your parcel is ready just today,
I have sent you a first parcel several days ago (as I have written to you) but I have made a mistake and the parcel turned back to me, sorry.
Since I had in this time developed a new release of this opamp, that have a new pcb with upgraded layout, (as I have written to you) I think to send to you these new opamps instead the old version, because I wanted to give you, at the same price, the new version that better sounding.
Moreover, I make these opamps by hands, the germanium DOA's are more complex to make respect its normal version with silicium trasistors for some reasons. BTW I do several tests, and some of these ones I repeat two times : before and after the potting process with the epoxy resin to be sure that the quality are guarantee. If a DOA doesn't pass a test I don't sell it, so I must remake it. This work requires time. For me giving quality to customer is a point of honor like my customers know.
I do this for a cheap price, so cheap that my friends suggested to me to make high the prices.
Tomorrow, I will send the parcel to you and I will send you the tracking number and scuse me for the delay time but I worked for you and for several other customers in these days.

Pier Paolo

 

Title: Re: APP discreet op amps
Post by: Tweekhead on November 10, 2010, 04:25:24 PM
Pier,

Thank you for the reply, and I eagerly await a tracking number. You must understand my distress, as after 45 days, no package...
The reason I decided to buy your DOAs is the positive reputation that your builds have. I have a very modest studio that could use the extra 2 mic pres awaiting the DOAs for the last month.

Thanks,

Arthur
Title: Re: APP discreet op amps
Post by: ppa on November 11, 2010, 07:58:54 AM
I have just sent to you an email with the shipping doc and the tracking number.
scuse me again for the delay

Pier Paolo  ;)
Title: Re: APP discreet op amps
Post by: Tweekhead on November 11, 2010, 11:28:41 AM
Pier,

Thank you so much, and I'll let you know when I get them.
Title: Re: APP discreet op amps
Post by: pacemaker on November 11, 2010, 04:34:38 PM
parcel received ,
thanks you very thank !
francois
Title: Re: APP discreet op amps
Post by: ppa on November 12, 2010, 05:29:30 PM
Francois, let me know how they sound since they are new versuion, please, thanks

Pier Paolo

Title: Re: APP discreet op amps
Post by: pacemaker on November 13, 2010, 06:04:49 AM
No problem pier,
will do it asap,
Tweekhead, don't worry , i also have waiting 45 days for my parcel
but as Pier said , it takes some time to build and test these babies,
pier, maybe you should warn people that it takes you a month at least
to build ans ship the opamps,
And people won't worry about the delay ;-)
best regards,
francois
Title: Re: APP discreet op amps
Post by: Tweekhead on November 13, 2010, 08:35:48 AM
Thanks again, I can't wait to get them!
Title: Re: APP discreet op amps
Post by: Tweekhead on November 19, 2010, 01:00:08 PM
Pier,

I received the 2 germanium DOAs today and plugged one in for a quick test. It sounds fantastic! I can't wait to try it out on electric guitars. Thanks for the great product, and I apologize for the drama, but seeing as we are unfamiliar with each other, and I only had 45 days for recourse from Paypal I had no other choice.

Thanks again,

Arthur
Title: Re: APP discreet op amps
Post by: ppa on November 20, 2010, 04:55:13 PM
thank you to having bought from me and for comments.
Pier Paolo
Title: Re: APP discreet op amps
Post by: ppa on November 22, 2010, 01:17:47 PM
This is the APP1040 module.
APP1040 pre has a new topology to avoid electrolityc caps in the amplification stage.
It has the DOA's positive input pin directly connected to the DI, as is in the API3124 to do an example.
It is designed for APP DOA's , 2520 , 990, Forsell DOA's and MM99 and others.

I have posted the prototype pics here http://www.groupdiy.com/index.php?topic=33576.240

APP1040 is not a 312 but a new project to be clear, who knows my opamps can have an idea of its performance.
APP1040 can use several trasformers from: Lundhal, OEP, ED trasformers, Altran, jensen , cinemag, JLM, Sowter.

  
 
Title: Re: APP discreet op amps
Post by: creal on December 10, 2010, 09:40:05 AM
Hello Pier Paolo,

Pm'ed you
I'd like 4 APP2050 for the make up gain in my solid state pultec.

Creal
Title: Re: APP discreet op amps
Post by: deuc224 on December 11, 2010, 06:31:24 PM
It has 32 DB of gain?
Title: Re: APP discreet op amps
Post by: ppa on December 11, 2010, 06:43:19 PM
no, it isn't. Its gain depends by trasformers' ratios, the resistors used in the NFB net and the DOA used.
However with an APP2050, the Classicapi input an output trasformers the standard setting gives 64 dB of gain.


 
Title: Re: APP discreet op amps
Post by: creal on December 16, 2010, 05:15:51 AM
Hello Pier Paolo,
Paypal'ed for the  DOA APP2050 this morning

Creal
Title: Re: APP discreet op amps
Post by: ppa on December 16, 2010, 05:28:18 AM
Hello Pier Paolo,
Paypal'ed for the  DOA APP2050 this morning

Creal

thanks
Pier Paolo
Title: Re: APP discreet op amps
Post by: delphi on December 16, 2010, 11:19:42 PM
I am building 12 of Mitsos 312/990 preamps. I have used JLM DOA's for 4 of them and want use your DOAs for 4 more "2050" types and 4 for a 990 type.

Which of your DOA's do you recommend for the Mitsos design.If all of your 2050 types are OK for this design (I dont want to use servos) - then I would appreciate a comment on the subjective "sound" of each of your DOA's so I can "mix and match.  The 990 versions will all be using 1:2 ratio input transformers, whilst the rest are using 1:5 or 1:6. What would the FB resistor value need to be with a gain pot of 10K? _ I seek a total gain of 60db or better
Title: Re: APP discreet op amps
Post by: ppa on December 17, 2010, 09:39:14 AM
I am building 12 of Mitsos 312/990 preamps. I have used JLM DOA's for 4 of them and want use your DOAs for 4 more "2050" types and 4 for a 990 type.

Which of your DOA's do you recommend for the Mitsos design.If all of your 2050 types are OK for this design (I dont want to use servos) - then I would appreciate a comment on the subjective "sound" of each of your DOA's so I can "mix and match.  The 990 versions will all be using 1:2 ratio input transformers, whilst the rest are using 1:5 or 1:6. What would the FB resistor value need to be with a gain pot of 10K? _ I seek a total gain of 60db or better

I make a version of JE990 I called APP99. This one is similar to JE990, there're differences in the frequency compensation circuit.
My 99 has a new circuit that does not use any inductance (used inside 990 in the 1st stage) and also gives great stability, this new circuit is the same used in the APP2050. The other difference is in its front-end that uses two discrete ultra low noise mached transistors insted the LM394. Moreover, the transistors inside are different types. This APP99 can be used with 1:2 input trasformers.
APP99 run in the mitsos preamp with servo or with out cap.
regarding the pot I am seeing for it.


APP2050 runs in the mitsos preamp set in 312 mode without servo, can be used input trasformers with ratio from 1:5 to 1:10 , I council the 1:7 classicapi in trasformer.

I will you all indications to set the mitsos preamp with APP99 and APP2050 opamps.







Title: Re: APP discreet op amps
Post by: JBVries on December 18, 2010, 07:22:08 PM
Got my 6 PSU boards and I gotta say the quality of these things are absolute tops. Thanks for the great power solution!
Title: Re: APP discreet op amps
Post by: ppa on January 03, 2011, 10:18:35 AM
this is the APP1040's PCB
Title: Re: APP discreet op amps
Post by: ppa on January 03, 2011, 10:24:45 AM
and this is the APP meter2 , this meter is usable with the APP1040 board and with other pres.
Meter2 is based on the LM3915 by National and drives 10 leds, but who want can use less leds.
This board has power supply voltages   in range +- 16V to +-24V.
With the multiturns trimmer can be set fine the 0 dbu led.
 
  
Title: Re: APP discreet op amps
Post by: ppa on January 03, 2011, 04:41:45 PM
and this is the meter2's pcb
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: dalmaproductions on January 09, 2011, 08:29:32 AM
Hi Paolo,
I've tried to contact you via email, and via PM with no success. My email gets: "Delivery to the following recipient failed permanently..".

Is there an email address I can contact you at? Send it via PM please.

Miguel
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on January 09, 2011, 09:58:44 AM
you may contact me to  AMSMicro  [at]  katamail  [dot]  com    , thank you
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: kepeb on January 13, 2011, 12:00:09 AM
hey
like the look of your new vu.
do you have a BOM?
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on January 15, 2011, 05:59:47 PM
the meter2's schematic
Title: Re: APP discreet op amps
Post by: creal on January 17, 2011, 12:10:47 PM
Hello Pier Paolo,
Paypal'ed for the  DOA APP2050 this morning
Creal

Hello Paolo,

Any news about the 4 DOA?
I still waiting 2 of them for finish my EQs.
I have a question, do you think, it's a good way to make a 325 API clone as Makeup gain amp for the meq5?
I need 16db gain.

Thx
Cyril 
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on January 17, 2011, 03:38:28 PM
Scuse me for the time, but I am yet waiting the epoxy resin to pot your opamp and other 40.

however these 4 are new SMD version using panasonic metal film resistors in the signal path (very very good resistors), and this nwe version sound much better than the previus. It has a very realistic guitar, for example, with realistic ultra fast transients. Sorry, they need another week to send them.

For Makeup gain you could use a 325 api clone or, if you want, an APP1040 board without input trasformer using its DI input.


Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: mrcase on January 17, 2011, 04:33:06 PM
hi!

Could you tell me the dimensions of the led-meter pcb?

thanks!
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on January 17, 2011, 04:46:45 PM
50x70 mm
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on January 17, 2011, 04:50:10 PM
or for the english people 1.96 x 2.72 in.
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: mrcase on January 17, 2011, 06:29:20 PM
thanks!
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: creal on January 17, 2011, 07:34:39 PM
Scuse me for the time, but I am yet waiting the epoxy resin to pot your opamp and other 40.
however these 4 are new SMD version using panasonic metal film resistors in the signal path (very very good resistors), and this nwe version sound much better than the previus. It has a very realistic guitar, for example, with realistic ultra fast transients. Sorry, they need another week to send them.
For Makeup gain you could use a 325 api clone or, if you want, an APP1040 board without input trasformer using its DI input.

No problem for the delay, we have the new version;)
it's a good news.


For the makeup amp, i looking for something close to the original pultec EQPA3 schematic.
I search on the web but i don't find any schematic of this circuit.
I like to use the minimun of components for this amp.
I not sure is the better option because it's the first time i use DOA.
But i like to experiment and learn.
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: 12volts on January 18, 2011, 07:46:39 AM
Hi PPA,

What would the total price be for 10 LED metering boards and 4 power supplies shipped to the UK. I would be paying by PayPal.
Many thanks,

Frank
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on January 18, 2011, 03:11:46 PM
Hi Frank,

10X Meter2 PCB's= 6.5x10 = 65 eur

4x PSU2 PCB's = 6x4 =  24 eur

S&H to UK with registered mail service = 8 eur

----------------------------------------------
TOTAL    97 eur  

thanks
cheers
Pier Paolo
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: 12volts on January 19, 2011, 05:58:52 AM
Hi paypal sent thank you.
On paypal I've asked for 2 PSU boards, it should be 4 as per your quote.
I made the mistake because I'm thick.


Frank
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on January 19, 2011, 11:40:58 AM
thanks for the payment
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: pacemaker on January 26, 2011, 06:10:26 AM
Hi Paolo !
don't know if your first name is much paolo or pier,
i guess it's paolo ;-)
i would like to know how much is shipping to France
for 6 PSU pcbs,
and if you have them in stock cause i need them soon,
regards,
francois
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on January 26, 2011, 08:41:17 AM
My full name is Pier Paolo, my surname Abbate.

my family call me Paolo (Paul in the english countries), some my friends Pier Paolo, some Paolo and some Pier.

the shipping costs are 8.5 eur using registered mail because 6 pcs weigh 160 gr.. Poste italiane are less cheaper than France post as many things in France.
The priority mail is not tracked, it has not invoice, and costs only 4.5 eur but I don't council it.
These PCB's are 2 mm of thickness and FR4 vetronite with 70um of copper thickness so they weigh a bit (are made in Italy)
I have the boards available and ready to send out.

thanks
cheers
Pier Paolo
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: pacemaker on January 26, 2011, 11:46:38 AM
ok for registered shipping and 6 boards,
Is paypal possible ?
If so what's your paypal adress please ?
or you can send me an invoice using the email function.
best regards,
Francois
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on January 26, 2011, 11:57:41 AM
is [email protected]

thanks
cheers
Pier Paolo
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: dingo on January 28, 2011, 01:01:36 PM
HELLO!
here my new preamp-DI  done with  ppa1040 board,ppa2050,EA transformers,ppa PSU
sound fantastic,very clean,lot of gain....
thank you  Pier Paolo
i am working on a new one with ppa germanium DOA and lundahl on input
very god job!! ;D
dingo.
(http://i108.photobucket.com/albums/n39/ingosch/Picture111.jpg)
(http://i108.photobucket.com/albums/n39/ingosch/Picture118.jpg)
(http://i108.photobucket.com/albums/n39/ingosch/Picture103.jpg)
(http://i108.photobucket.com/albums/n39/ingosch/Picture113.jpg)
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: tmuikku on January 28, 2011, 03:03:32 PM
Looks great Dingo! I've gpt some ppa 2050 in 312 board and can't complain :)
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: brennyb on February 04, 2011, 05:02:38 PM

APP STUDIO ING. PSU2 ,  CONFIGURABLE PSU BOARD KIT

Hi can you tell em what the LED channels of the PSU board kit are capable of kicking out please...?

Brendan.
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: pacemaker on February 05, 2011, 07:13:24 AM
Hi Paolo,
payment sent with paypal for 6 PSU2 pcbs with registered shipping,
best regards,
francois
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on February 05, 2011, 07:53:48 AM

APP STUDIO ING. PSU2 ,  CONFIGURABLE PSU BOARD KIT

Hi can you tell em what the LED channels of the PSU board kit are capable of kicking out please...?

Brendan.

Hi Brendan,

the LED+ and LED- points are for the power LED to indicate that the power is just on. This out can used to drive several LED's soldering a wire in place of R7. With this wire LED- will be connected to GND, and considering that LED+ is connected to +Vcc out, it's possible having a second connector (LED-,LED+) to supply DC power to the LED's , but, it's important, each LED must be have its current limiting resistor. 

regards
Pier Paolo

 


 
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on February 05, 2011, 07:54:42 AM
Hi Paolo,
payment sent with paypal for 6 PSU2 pcbs with registered shipping,
best regards,
francois

thanks Francois,

I'm just going to do your parcel.

regards
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: r2d2 on February 12, 2011, 12:49:41 PM
Hello "PPA"
please the psu kit include all parts needed ?
capacitors are "low esr" ?

peace
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: dingo on February 13, 2011, 06:33:34 AM
hello! :D
here the new born preamp di box app1040 with APP germanium doa, APP led bar,lundahl-Ea transformers,APP psu.
sound huge on el. guitars,el. bass,will try on other instruments.
thank you Pier Paolo!!

(http://i108.photobucket.com/albums/n39/ingosch/SP_A0292-1.jpg)
(http://i108.photobucket.com/albums/n39/ingosch/SP_A0299.jpg)
(http://i108.photobucket.com/albums/n39/ingosch/SP_A0297.jpg)
(http://i108.photobucket.com/albums/n39/ingosch/SP_A0296.jpg)

DINGO.
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on February 14, 2011, 05:19:21 PM
thanks DINGO for having used for the first time my boards and opamps.
Very good work!

Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: rmaier on February 14, 2011, 08:07:56 PM
Cool. Will the preamp boards be available for purchase soon?
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on February 15, 2011, 04:03:18 AM
yes,

    the app1040 mic/di preamp boards are available to send out and the PSU boards too.


they are double face PCBs and you can use several trasformers and DOA's , the Ea transformers go very good in this project.
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on February 15, 2011, 09:24:06 AM
regarding prices the APP1040  pre PCB only costs

15 euros each, from 1 pc to 4 pcs
13.5 euros from 5 to 8 pcs
12 euros from 9 to 20 pcs.

VAT included
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out, new versions.
Post by: 12volts on February 16, 2011, 12:15:56 PM
PPA,
I received the PSU and VU bargraph PCBs from you, many thanks. Where can I
find your schematic for the VU board? I'm stuck without it.

Frank
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out, new versions.
Post by: ppa on February 16, 2011, 02:41:48 PM
just arrived? I thought it would arrived later, so, send me an email that I will send all docs by email, please.

Pier Paolo
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out, new versions.
Post by: ppa on February 17, 2011, 07:41:18 AM
email sent yesterday
Title: Re: APP discreet op amps, LED Meter, PSU board.
Post by: ppa on February 17, 2011, 07:55:50 AM
Hello "PPA"
please the psu kit include all parts needed ?
capacitors are "low esr" ?

peace

yes, the kit includes all parts needed for its circuitry.
the caps are not low esr but they are 105C° type (except two caps of 85C°), all res are 1% metal film type.
However, is not required to have low esr components in this type of circuit, famous and expensive commercial gears do not use low esr components in their 50Hz PSU's. I agree with them because the most important feature here is the reliability, infact I use 105C° components and PSU's circuitry is designed for reliability and low noise. (for example the circuit is also designed to avoid to stress the LM regulators in the off-on state). The PSU's PCB is vetronite FR4 2mm with copper of 70um made in Italy (often is 35um).
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out, new versions.
Post by: rmaier on February 17, 2011, 02:16:52 PM
Thanks for the info. Interested in four APP1040 preamp boards and one PSU2 kit plus shipping to Canada (postal code T3G 4J3). How much, and which paypal address for Canadian customers?

Ralph
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out, new versions.
Post by: mata_haze on February 17, 2011, 05:30:37 PM
Hello PierPaolo,
email sent regarding Germanium DOA.

Best,
Mattia.
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out, new versions.
Post by: creal on February 17, 2011, 05:47:30 PM
Hi Peir Paolo

Quote
APP2050 and APP2050E ready to send out, new versions

i hope to find the babies in my mail box soon;)

Cyril
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out, new versions.
Post by: creal on March 08, 2011, 05:52:13 PM
Hi Pier Paolo,
I am worried, I have not received the doa the four DOA, i think this is not normal?
Do you have a tracking number? Can you check this point with your post office?
Best Cyril

thanks you for this quick response and the express shipping
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out, new versions.
Post by: baadc0de on March 08, 2011, 06:27:26 PM
Hi Pier,

how much lead time for APP10 or APP99F?

Cheers,
B.
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out, new versions.
Post by: creal on March 14, 2011, 05:55:06 AM
Hi Pier,

Thanks you, i received the DOA this morning.

I'll replace the Gar2520 by your APP2050 this evening.

Best
Cyril
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out.
Post by: mrclunk on March 23, 2011, 06:38:06 AM
Thanks for the PSU boards Pier.

Have a question...

I need 24VDC and 48VDC (for Telefunken modules)

I'm feeding the pcb from a wall wart 24VAC adapter. (so single secondary / no center tap)

Do i connect the 24VAC just to pins 1 and 4 of the input connector?
and then solder the jumper for 24VDC.
thanks
Paul
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out.
Post by: ppa on March 23, 2011, 08:48:24 AM
this PSU module can run using one secondary only having all the main outs and +48 out working, so also the -Vcc out works with one secondary only connected, but C19 becames 220uF 63V (or voltage greater) instead of 100uF 63V, moreover C20 is omitted.

This secondary must be connected to the AC1A and AC1B inputs and the jumper must be set for 24V for 24V out (for 16v out the jumper goes to 16v position, is not changed the jumper setting).


If you need only the +Vcc and the +48 outs than you can connect the secondary's wires in other manner but some things must be done , so , since I need to give you a schematic and/or some indications I am sending them by email to you.  8)

Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out.
Post by: r2d2 on March 24, 2011, 09:01:44 AM
to " PPA "
sorry for question
it's possible increase the "mA" ratio of the 48V out as well?
like 250-300 mA

peace!
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out.
Post by: ppa on March 24, 2011, 09:38:48 AM
to " PPA "
sorry for question
it's possible increase the "mA" ratio of the 48V out as well?
like 250-300 mA

peace!


yes, just changing 3 caps
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out.
Post by: r2d2 on March 24, 2011, 11:22:42 AM
thanks "PPA"
i think to need also 800mA/1A on the +24V
no -24V needed , just 0V
as i see at " post 1 " this psu board supply 600mA at +24V

possible also increase this ratio?
peace!

to " PPA "
sorry for question
it's possible increase the "mA" ratio of the 48V out as well?
like 250-300 mA

peace!


yes, just changing 3 caps
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out.
Post by: mrclunk on March 24, 2011, 11:52:53 AM
Quote
f you need only the +Vcc and the +48 outs than you can connect the secondary's wires in other manner but some things must be done , so , since I need to give you a schematic and/or some indications I am sending them by email to you.  Cool
Thanks Pier.

r2d2
An LM317 should handle 800mA fine just make sure you have a chunky heatsink and increase the value of the filter caps after the diode bridge.
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out.
Post by: mrclunk on March 24, 2011, 06:45:50 PM
Hi, think this would work no?
24 VAC connected to AC1A and AC2B.
Title: Re: APP discreet op amps, APP2050 and APP2050E ready to send out.
Post by: ppa on March 25, 2011, 12:46:25 PM
Hi, think this would work no?
24 VAC connected to AC1A and AC2B.

instructions sent.
Title: Re: APP op amps, PSU, LED METER, mic/DI preamp boards, NEW!! GAINCLONE LM3886
Post by: AW_music on April 19, 2011, 06:44:16 PM
Hi Pier,

i've used your Germanium OPAMPs on two PETER's API 5003 EQ , that I built.
I'VE TO SAY THEY SOUND INCREDIBLE !
Very Creamy, and very tasty !
Perfect !

Thanks
Title: Re: APP op amps, PSU, LED METER, mic/DI preamp boards, NEW!! GAINCLONE LM3886
Post by: AudioHammer on April 22, 2011, 01:21:41 PM
Hi Pier,

I am trying to send you a PM and email.  Your PM box is full and I am getting an error message when sending to your email address.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

>>> [email protected] (after RCPT TO): 550 [email protected] unknown user account
________________________________________

Audiohammer
Title: Re: APP op amps, PSU, LED METER, mic/DI preamp boards, NEW!! GAINCLONE LM3886
Post by: ppa on April 22, 2011, 05:49:07 PM
Hi Pier,

I am trying to send you a PM and email.  Your PM box is full and I am getting an error message when sending to your email address.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

>>> [email protected] (after RCPT TO): 550 [email protected] unknown user account
________________________________________

Audiohammer

yes, it is, sorry, this address does not work so I am changing it with the     454530  /at/  katamail  /dot/ com that's my alternative address
I have deleted a lot of message now, since to make an order the customers prefer send me messages

cheers
Pier Paolo
Title: Re: APP op amps, PSU, LED METER, mic/DI preamp boards, NEW!! GAINCLONE LM3886
Post by: radiance on April 23, 2011, 01:45:15 PM
Any news on those solid state pultec amp boards?
Title: Re: APP op amps, PSU, LED METER, mic/DI preamp boards, NEW!! GAINCLONE LM3886
Post by: ppa on April 23, 2011, 02:00:44 PM
Any news on those solid state pultec amp boards?

I am deciding on the PCB company to order the PCB's for best quality/price ,

I have just some persons interested on this project, I am waiting some quotes from these PCB companies and so I will start the group buy to see if there are others interested.

Title: Re: APP op amps, PSU, LED METER, mic/DI preamp boards, NEW!! GAINCLONE LM3886
Post by: radiance on April 24, 2011, 10:48:02 AM
I'm in for 4 boards depending a little on the price...
Title: Re: APP op amps, PSU, LED METER, mic/DI preamp boards, NEW!! GAINCLONE LM3886
Post by: benlindell on April 24, 2011, 11:46:44 AM
Any news on those solid state pultec amp boards?

I am deciding on the PCB company to order the PCB's for best quality/price ,

I have just some persons interested on this project, I am waiting some quotes from these PCB companies and so I will start the group buy to see if there are others interested.



I'm definitely going to need to get 4 of these.
Title: Re: APP op amps, PSU, LED METER, mic/DI preamp boards, NEW!! GAINCLONE LM3886
Post by: baadc0de on April 24, 2011, 03:48:52 PM
Any news on those solid state pultec amp boards?

I am deciding on the PCB company to order the PCB's for best quality/price ,

I have just some persons interested on this project, I am waiting some quotes from these PCB companies and so I will start the group buy to see if there are others interested.



I'm definitely going to need to get 4 of these.

Four for me too, indeed.
Title: Re: APP op amps, PSU, LED METER, mic/DI preamp boards, NEW!! GAINCLONE LM3886
Post by: creal on April 25, 2011, 02:38:57 AM
Any news on those solid state pultec amp boards?

I am deciding on the PCB company to order the PCB's for best quality/price ,

I have just some persons interested on this project, I am waiting some quotes from these PCB companies and so I will start the group buy to see if there are others interested.


i'm in for 2 ss pultec amp boards and 2 Germanium OPAMPs
Cyril

I'm definitely going to need to get 4 of these.

Four for me too, indeed.
Title: Re: APP op amps, PSU, LED METER, mic/DI preamp boards, NEW!! GAINCLONE LM3886
Post by: ppa on April 25, 2011, 05:41:29 AM
regarding the pulteq io boards now the list for group buy is the following

4   Creal   + 2 DOA's germanium
4   Matthew Jacobs
2   Mylesgm   + 2 DOA's germanium
4   Radiance
4   Benlindell
4   baadc0de
2   ilfungo

==============
total 24  PCB's

 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 25, 2011, 05:54:50 AM
for the features they are:

it has trasformerless input only, usable with a IC opamps or a DOAs,
 
the ouptstage can use IC opamps or DOA's and can be used with or without trasformer  

you can use many IC opamps and DOA's in these stages as NE5534, OPA134, OPA602, OPA604, OPA606, OPA627.....and many others, for DOA's:  APP opamps , API2520's , FT992, MM99, JE990, JLM and others.

if you want use a bipolar DOA (or IC opamp) on out stage you can use the fet buffer onboard to avoid the noise for the input noise current of the bipolar DOA's and IC opamps.

it's 173 x 102 mm  (6.8 x 4 inchs)

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ChrisPbass on April 25, 2011, 06:13:49 AM
Hi Pier, I'm interested in atleast 2 boards and possibly 4
cheers
Chris
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 25, 2011, 06:29:46 AM
since they are 30 PCB's than the price per board is 12 euros that're 17.5 US $ for who want to pay with US $

 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: baadc0de on April 25, 2011, 07:15:08 AM
When will you be closing? Do you think we can get more people onboard?

One can use the IC opamp to debalance the signal and your DOA to boost the signal, without transformer? Can we use APP2055 without FET additional buffer?

Cheers,
B.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: radiance on April 25, 2011, 07:17:14 AM
since they are 30 PCB's than the price per board is 12 euros that're 17.5 US $ for who want to pay with US $

 

great!   70 more for the next price break....
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 25, 2011, 07:31:49 AM
When will you be closing? Do you think we can get more people onboard?

One can use the IC opamp to debalance the signal and your DOA to boost the signal, without transformer? Can we use APP2055 without FET additional buffer?

Cheers,
B.

yes, you can

the buffer is only for bipolar opamps
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: tzman on April 25, 2011, 07:50:11 AM
I'm interested in two boards!
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Albrebreton on April 25, 2011, 08:54:11 AM
Hi Pier, I'm definitely in for 4 of these.
Cheers.
Alberto
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 25, 2011, 02:01:13 PM
I would like to close the group buy at 50 pcs or after 10 days.

since these boards need to be powered I offer at only 5 euros one PSU2 board for each two IO pulteq boards bought, this is special price I do to the diy prodigy members.

Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ruairioflaherty on April 26, 2011, 02:54:10 AM
Hi Pier,

I'll take a pair of the Pultec boards, and a PSU board (or kit if there's one available).

Thank you,
Ruairi
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ChrisPbass on April 26, 2011, 03:05:18 AM
I'll take 2 pultec boards and 1 PSU board too Pier.
cheers
Chris
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: radiance on April 26, 2011, 05:04:23 AM
I'l have 2 psu boards with my existing order of 4 pultec boards...
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: leadbreath on April 26, 2011, 05:40:50 AM
hi pier

im interested in the Ge DOA's, do u still have any stock?

would these be a straight swap on a 312 circuit and would they be ok on +/-18V??

cheers
mick

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: 0dbfs on April 26, 2011, 07:12:00 AM
Hi Pier, Does your pultec board do one or two channels ?

Thanks man!
-jonathan
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 26, 2011, 07:26:08 AM
Hi Pier, Does your pultec board do one or two channels ?

Thanks man!
-jonathan


one channel only

thanks
kind regards
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: 0dbfs on April 26, 2011, 07:28:52 AM
Thanks Pier, I'll go with six channels worth of pultec I/O boards and three PSU's please.

Much appreciated !

Best,
jb
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 26, 2011, 07:34:31 AM
hi pier

im interested in the Ge DOA's, do u still have any stock?

would these be a straight swap on a 312 circuit and would they be ok on +/-18V??

cheers
mick



no, because in these days I have had several orders for this one,
however I am going to start the SMD version (except for the germanium transistors that are PH) so I will have a big stock of them (we speak of working 20 days of time lead). The SMD version is upgraded so it is better sounding.
The SMD resistors in the signal path are panasonic metal film type (top level and expensive).    
 
the 2050 germanium version is rated for +-16V of power supply

kind regards
Pier Paolo



    


Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: tzman on April 26, 2011, 07:58:39 AM
I'd like 1 PSU board to go with my 2x IO board order.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: leadbreath on April 26, 2011, 09:16:42 AM
Quote
the 2050 germanium version is rated for +-16V of power supply

ok understood, thanks pier

and the mill max pins are compatible on the 312 pcb?? (for polarity)

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 26, 2011, 09:18:56 AM
Quote
the 2050 germanium version is rated for +-16V of power supply

ok understood, thanks pier

and the mill max pins are compatible on the 312 pcb?? (for polarity)



yes, they are
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Ptownkid on April 26, 2011, 10:47:28 AM
I have not had the time to follow this too closely...do we need these to compliment ruffrecords pcbs?
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Andreas Pfeiffer on April 26, 2011, 11:16:47 AM
It would be really nice to get some more info on these IO boards.
Here, http://www.groupdiy.com/index.php?topic=43859.120
I can see the board, but its hard to find out how it works and which connections are needed.
If you cant put up a schematic, how is about a block diagram?
Where is the board manufactured? China or Italy?
Estimated delivery date would also be helpful...
Thanks for your effort in making these board :)
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 26, 2011, 03:19:08 PM
I have not had the time to follow this too closely...do we need these to compliment ruffrecords pcbs?

Ruffrecords has designed the passive eq net, this net needs an input and an output stage to compliment ruffrecords pcbs.

Moreover, Ruffrecords has designed a tube out stage for his passive eq net too.
Using this tube stage and a line trasformer as input stage it is possible to have a complete inductorless pulteq eq1a

But the Ruffrecords' out stage is based on tubes, who wants a solid state input and out stage to compliment ruffrecords pcbs
can be use this my IO board, if he want.  


 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Grooveteer on April 26, 2011, 04:08:28 PM
I would like 2 I/O boards and 1 PSU please.

 :)

Thanks Pier!
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 26, 2011, 05:40:34 PM
It would be really nice to get some more info on these IO boards.
Here, http://www.groupdiy.com/index.php?topic=43859.120
I can see the board, but its hard to find out how it works and which connections are needed.
If you cant put up a schematic, how is about a block diagram?
Where is the board manufactured? China or Italy?
Estimated delivery date would also be helpful...
Thanks for your effort in making these board :)

yes , I am going to put up the shematic tomorrow.

the connections are:

input stage (gain= 0.5 or 1 , 24 dbu)
- balanced line input with 20K of input impedance, that 's the line input of the gear.
- sbalanced out to connect to the passive eq net's input (ruffrecords' eq boards)

fet buffer stage (gain = 1,  12 dbu, note that the passive eq stage attenuates a lot the signal)
- sbalanced 2.2M input from out of ruffrecords eq boards
- sbalanced out
 
makeup gain stage and out stage (20-36 db of gain max, 24dbu - 32 dbu out,  depending by configuration used)
- sbalanced input 47k of impedance, the signal cames from buffer stage out
- balanced trasformerless out 
- balanced out with trasformer (several trasformers can be used in)
- connector for potentiometer for make up (25k rev log or 10k rev log)

connector for power supply , dual voltage

tomorrrow other infos, now I am going to bed





Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 27, 2011, 04:53:41 AM
this is the schematic, soon the other docs
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 27, 2011, 05:03:15 AM
this is the image

(http://home.teletu.it/APPSI/IO%20pulteq%20eq%20board%202%20APP.bmp)
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: creal on April 27, 2011, 06:56:56 AM
good news for the PSU

2 Psu for me
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: okgb on April 27, 2011, 08:45:27 AM
I'll take two boards ,
if they're coming from you in Italy
i may take the opportunity to order some opamps
of your's as well
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: benlindell on April 27, 2011, 12:10:45 PM
When do you need us to paypal you for the IO boards? when we do I'd like to add 4 PSU boards and 4 LED VU boards too
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 27, 2011, 03:53:15 PM
regarding time lead I am waiting some days to permit other members to order.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: 0dbfs on April 27, 2011, 04:38:00 PM
Awesome !

Please let us know the pmt details when you are ready. Wouldn't want to miss this one.

Cheers,
jb
Title: Re: IO board for PULTEQ EQ GROUP BUY - APP DOA's
Post by: Tubemooley on April 28, 2011, 05:37:04 AM
I just sent an e-mail to 454530/at/katamail/dot/com. I hope that's the correct address.
Please put me on the list for four (4) Pultec IO boards and two (2) PSU2 boards.
I can pay you whenever you want. Thanks, Dana Walcott.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 28, 2011, 06:58:06 AM
regarding the pulteq io boards, now the list for group buy is the following

4   Creal   + 2 DOA's germanium + 2 PSU boards
4   Matthew Jacobs
2   Mylesgm   + 2 DOA's germanium
4   Radiance  + 2 PSU boards
4   baadc0de
2   ilfungo
2   tzman + 1 PSU boards
4   Albrebreton
2   ruairioflaherty +1PSU kit
2   chrispbass  + 1 PSU boards
6   0dbfs + 3 PSU boards
2   Grooveteer + 1 PSU boards
4   benlindell + 4 PSU boards + 4 LED VU
4   Tubemooley  + 2 PSU boards

there are 48 boards
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: baadc0de on April 28, 2011, 07:53:15 AM
I would like to add as many PSU kits as is required for 4 channels.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Davo on April 28, 2011, 08:20:27 AM
Hi Pier,

Please put me down for 2 Pulteq i/o boards and 1 psu

Thanks!
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: leadbreath on April 28, 2011, 11:29:48 AM
hey pier

nice work mate!! please let us know a soon as u have the Ge DOA's

im pretty keen to hear them!!

cheers
mick
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 28, 2011, 12:35:41 PM
hey pier

nice work mate!! please let us know a soon as u have the Ge DOA's

im pretty keen to hear them!!

cheers
mick

the Ge opamp are going to be made by an assembly company with automatic line,

the time are: 15 working days to made the ge DOA's' PCB's

8 days to assembly them

5 days for shipping to me

2 days to solder the GE transistors

4 days to test the opamps and to packet them

I could reduce these times but the price will be higher reducing these times because companies want more money to work with less lead times, since I want to be competitive in the market, I order with time and quantity high to reduce the final price as weel as possible to final customer, since I don't want reduce the final price to him using cheap components.

the same thing for the APP2050, APP2050E and APP2055.

  
  
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: leadbreath on April 28, 2011, 01:57:26 PM
hey no hurries pal, ive been waiting for a Ge DOA for years!! im sure i can wait for another few weeks ;D
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on April 28, 2011, 06:03:18 PM
Hi pier,

Please put me down for 2 pultec I/O boards.

Cheers,
Chris
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: desol on April 28, 2011, 06:20:10 PM
Hi Pier,

I would like 2 pultec i/o boards, one psu board and four app2050 opamps.

Darrick
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Andreas Pfeiffer on April 29, 2011, 09:00:34 AM
Please count me in for two boars for Pultec IO and one PSU board.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 29, 2011, 04:06:33 PM
regarding the pulteq io boards, now the list for group buy is the following

4   Creal   + 2 DOA's germanium + 2 PSU boards
4   Matthew Jacobs
2   Mylesgm   + 2 DOA's germanium
4   Radiance  + 2 PSU boards
4   baadc0de
2   ilfungo
2   tzman + 1 PSU boards
4   Albrebreton
2   ruairioflaherty +1PSU kit
2   chrispbass  + 1 PSU boards
6   0dbfs + 3 PSU boards
2   Grooveteer + 1 PSU boards
4   benlindell + 4 PSU boards + 4 LED VU
4   Tubemooley  + 2 PSU boards
2   Songguy
2   desol    + 4  app2050
2   Andreas Pfeiffer + 1 PSU board

there are 54 boards
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ilfungo on April 29, 2011, 08:48:47 PM
Sorry for delay...
also 2 x PSU board
Grazie!
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Davo on April 29, 2011, 09:45:55 PM
Hi Pier,

You missed me on the list, please put me down for 2 pulteq boards and one psu

Thanks!
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 30, 2011, 10:15:23 AM
regarding the pulteq io boards, now the list for group buy is the following

4   Creal   + 2 DOA's germanium + 2 PSU boards
4   Matthew Jacobs
2   Mylesgm   + 2 DOA's germanium
4   Radiance  + 2 PSU boards
4   baadc0de
2   ilfungo + 2 PSU boards
2   tzman + 1 PSU boards
4   Albrebreton
2   ruairioflaherty +1PSU kit
2   chrispbass  + 1 PSU boards
6   0dbfs + 3 PSU boards
2   Grooveteer + 1 PSU boards
4   benlindell + 4 PSU boards + 4 LED VU
4   Tubemooley  + 2 PSU boards
2   Songguy
2   desol    + 4  app2050
2   Andreas Pfeiffer + 1 PSU board
2   Davo + 1 PSU board

there are 56 boards
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: creal on April 30, 2011, 01:59:03 PM
Hi Pier,
I want to build a pair of PM EQ in 500 format.
I like to know what is the in/out impedance of the board in transformless use.

Cheers

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 30, 2011, 02:44:22 PM
Hi Pier,
I want to build a pair of PM EQ in 500 format.
I like to know what is the in/out impedance of the board in transformless use.

Cheers



the balanced line input's impedance of the board is 20k.

the board has a fet buffer with 10 Mohm of impedance (sbalanced input) for the make-up gain stage,
it makes high to 10Mohm the input impedance of the make-up gain stage.

The make up gain stage has input impedance depending by opamp used.

With fet input opamps (ic opamps or DOAs) this stage can be set for 1Mohm or greater impedance,

with transistor input opamps, this stage can be set for the input impedance of 100k max,

however, even if 100kohm seem good, it is preferable using the buffer stage between the make up gain stage and Pulteq eq net. The reason is to reduce the noise given by input noise current of the bipolar input opamps  used in the  make up gain stage.

if are used fet input opamps into make up stage the buffer can be unused.

the out put impedance of the make up gain stage is of 100 Ohm in trasformerless mode
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on April 30, 2011, 03:37:14 PM
I like to know what is the in/out impedance of the board in transformless use.
Cheers
with +/-16V of power supply is not possible having more than 23 dBu /10kohm out in trasformerless mode, even if 23 dbu are not a bad max level.

with +-24V power in trasformerless mode with my opamps you have 26 dbu on 10kohm.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: creal on May 01, 2011, 03:06:01 PM
Pier, thanks for advices.
i have a pair of neve 1:1 600/600 ohms (neve VT24499).
Did you think they are good for the output?
Best
Cyril
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 01, 2011, 04:50:29 PM
yes, it is good

 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ChrisPbass on May 03, 2011, 11:43:18 AM
Hi Pier, when would you like payment for the pultec/psu boards?
best
Chris
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Albrebreton on May 04, 2011, 09:09:03 AM
Hi Pier, Sorry for my delay, I'll take four of the Pultec boards, and 4 PSU boards

Thank you
Alberto
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Michael Tibes on May 05, 2011, 07:29:00 AM
Hi Pier, I'm in for 4 pultec IO boards and 4 psu boards as well.

Michael
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 05, 2011, 07:56:02 AM
Hi Pier, when would you like payment for the pultec/psu boards?
best
Chris

I am waiting other orders.

Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Andreas Pfeiffer on May 05, 2011, 08:01:25 AM
other orders, or more orders for the IO board ???
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 05, 2011, 06:33:16 PM
I waiting other customers to permit them to be included in this group buy 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on May 06, 2011, 07:29:07 AM
Hi pier,

Can you add to my order:
2 psu's

And 2 germanium DOA's if you have them.

Thanks,
Chris S.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: leadbreath on May 06, 2011, 05:44:26 PM
ahh what the hell, count me in for 1 x Peq board.

so thats 1 x Peq and 1 x Ge DOA

cheers
mick
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: desol on May 06, 2011, 07:18:36 PM
I think i've got this all down...maybe a second set of eyes can confirm(tired today. can't.....flip....through pages...and pages...and pages......................and pages, right now.)


So, 1 pier psu will power 1 stereo Ian pultec, right? (ie: 2 i/o boards, for 4 ian pultec eq boards(hi/lo, hi/lo)
and....4 opamps are needed for the two i/o boards. 2 opamps per i/o board..unless you wanna use a transformer for each output...
then requiring just 2 doa's(inputs).


This is correct, right? zzz...
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ChrisPbass on May 06, 2011, 07:24:18 PM
I think i've got this all down...maybe a second set of eyes can confirm(tired today. can't.....flip....through pages...and pages...and pages......................and pages, right now.)


So, 1 pier psu will power 1 stereo Ian pultec, right? (ie: 2 i/o boards, for 4 ian pultec eq boards(hi/lo, hi/lo)
and....4 opamps are needed for the two i/o boards. 2 opamps per i/o board..unless you wanna use a transformer for each output...
then requiring just 2 doa's(inputs).


This is correct, right? zzz...


I hope so desol, else there's two of us in need of guidance!  ;D
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ruairioflaherty on May 07, 2011, 04:04:00 AM
4 opamps are needed for the two i/o boards. 2 opamps per i/o board..unless you wanna use a transformer for each output...
then requiring just 2 doa's(inputs).


This is correct, right? zzz...


It's late here but the above looks wrong to me.

I think it should read (corrections underlined)

4 opamps are needed for the two i/o boards. 2 opamps per i/o board..unless you wanna use a transformer for each output input...
then requiring just 2 doa's(inputs)(outputs).

Cheers,
Ruairi
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 07, 2011, 05:38:14 AM
the input section, that has the function to unbalance the input signal, uses or a DOA or an IC opamp to unbalance this signal (the user can put into it or a DOA or an IC opamp). In the same section there is a servo DC with a fet input IC opamp.

To sbalance the input signal you can use an (external) line trasformer in place of the input section of the IO board.
In this case, you can avoid to build the input section onboard because the line trasformer has the same function of the input section.

So , if you , want to get only DOA's in the signal path the cases are two depending if you use the input section or a
line trasformer to unbalance the input signal:

- if you use the input trasformer (only external) you need only a DOA per board, so for a stereo eq you need two DOA's

- if you use the input section of the board you need two DOA's per board, so for a stereo eq you need 4  DOA's.



 
 





edit: for orthographic error correction
  
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on May 07, 2011, 06:58:59 AM
Green question. What does sbalance mean?
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 07, 2011, 07:42:21 AM
Green question. What does sbalance mean?

thanks, I have done an error, I wanted to write "unbalance",

since the verb "unbalance" means "sbilanciare" in italian, I have written "sbalance" instead of "unbalance".

I have corrected it on my previus post.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on May 07, 2011, 08:34:08 AM
Grazie!
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: desol on May 07, 2011, 12:30:02 PM
4 opamps are needed for the two i/o boards. 2 opamps per i/o board..unless you wanna use a transformer for each output...
then requiring just 2 doa's(inputs).


This is correct, right? zzz...


It's late here but the above looks wrong to me.

I think it should read (corrections underlined)

4 opamps are needed for the two i/o boards. 2 opamps per i/o board..unless you wanna use a transformer for each output input...
then requiring just 2 doa's(inputs)(outputs).

Cheers,
Ruairi


Great. Thanks for catching that..

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 07, 2011, 02:15:23 PM
4 opamps are needed for the two i/o boards. 2 opamps per i/o board..unless you wanna use a transformer for each output input...
then requiring just 2 doa's(inputs)(outputs).

Cheers,
Ruairi


yes it is right
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on May 08, 2011, 04:25:10 PM
Put me down for 2 IO boards + 1 PSU set please if i'm not too late?

Cheers
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 08, 2011, 04:54:46 PM
No, it is not too late, but I am near to order the boards.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on May 08, 2011, 04:59:34 PM
OK thanks, just let me know the final price and payment detail when you need it :)

Cheers
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: lejeunes03 on May 08, 2011, 07:23:07 PM
hello,
2 IO board
2 psu
2 Ge DOA
for me plaese
thx
sebastien
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: desol on May 08, 2011, 07:44:51 PM
No, it is not too late, but I am near to order the boards.

Hi Pier...please remember to include 1 psu for me as well. I did include it in my pm to you, but some how it got missed.

Thank you! 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Citrus Hill on May 09, 2011, 12:18:16 AM
Hi Pier,
I'd like to purchase 10 pultec i/o boards and 5 psu2 boards.  can you let me know what the total would be in USD? 
Thanks,
Rob Mc.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 10, 2011, 06:06:57 AM
Hi Pier,
I'd like to purchase 10 pultec i/o boards and 5 psu2 boards.  can you let me know what the total would be in USD? 
Thanks,
Rob Mc.


11x10=110 euro (io board) , 5x5=25 (Psu2)    total = 135 euro that are 193.5 USD
shipping costs are unknown bacause I don't know the weight yet but with registered mail service might be in range 12.75 euro = 18 USD , Prices are indicative because they have to be recalculated at time of payment for the variable quote of USD.

I have done 11 euro pc being 10 boards

thanks
cheers
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Citrus Hill on May 10, 2011, 04:04:55 PM
Hi Pier,
Sounds good.  Put me down for the 10 I/O boards and the 5 psu boards.  Let me know when you would like payment.
Thanks,
 Rob
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on May 11, 2011, 10:28:55 PM
Total noob question.
 What is the exact purpose of this pultec I/O board. Please educate me. How is this different from the g- pultec boards I have? is that even a valid question?

Cheers,
Chris
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: baadc0de on May 12, 2011, 02:10:00 AM
Hi pier,

I would like to add 8 APP99F's and 2 PSUs to my order.

Thanks,
B.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: noulou on May 12, 2011, 07:40:38 AM
2 pultec io pcbs here please.

 :) :) :)
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: kepeb on May 12, 2011, 12:54:58 PM
how many is that up to now?
will you be stocking these after the groupbuy?
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 12, 2011, 06:25:09 PM
in this moment I have not any IO board available but I have ordered a stock of them to a PCB company, I should have them in 10-12 working days.

Regarding the PSU2 boards I have 74 of them ready to go out, but I have no kits available in this moment, I am waiting the components from distributors.

regarding APP2050GE I have not them available because I have had several orders in these months,
I am going to order to manufacturer company a little stock of them, it is little because it is the new version so I should test it before put it for sale.

regarding APP2050 and APP2050E I have some available

regarding APP2055 i have only a few of them but they are no available because I am going to use them for a trasformerless preamp I am developing.

regarding the gainclone amp I have 38 boards available.


cheers
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 13, 2011, 08:44:49 AM
regarding the pulteq io boards, now the list for group buy is the following

4   Creal   + 2 DOA's germanium + 2 PSU boards
4   Matthew Jacobs
2   Mylesgm   + 2 DOA's germanium
4   Radiance  + 2 PSU boards
2   ilfungo + 2 PSU boards
2   tzman + 1 PSU boards
4   Albrebreton + 4 PSU boards
2   ruairioflaherty +1PSU kit
2   chrispbass  + 1 PSU boards
6   0dbfs + 3 PSU boards
4   Grooveteer + 2 PSU boards
4   benlindell + 4 PSU boards + 4 LED VU
1   leadbreath + 1 germanium doa
4   Tubemooley  + 2 PSU boards
2   Songguy +1 psu pcb
2   desol    + 4  app2050
2   Andreas Pfeiffer + 1 PSU board
2   Davo + 1 PSU board
4   Michael Tibes + 4 psu boards
2   lejeunes03 +2 psu +2 Ge DOA
2   ej_whyte + 1 PSU
10  Citrus Hill + 5 psu boards
2   noulou
2   kepeb
 
there are 75 io boards
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Albrebreton on May 13, 2011, 09:03:45 AM
Hi Pier, I wrote you a few days ago, I would like to add 4 PSUs to my order.

Thank you
Alberto.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 13, 2011, 10:12:55 AM
ok , I have just added +4 psu boards



Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 13, 2011, 10:15:23 AM
Since the first 18 boards I have ordered will be to me in 7-10 days, I can accept the first payments, i have just sent a message to the first ones who have ordered the boards

thanks
regards
Pier Paolo

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: leadbreath on May 13, 2011, 10:26:27 AM
hey pier

dont forget to include me for 1 x IO board and 1 x Ge DOA.

cheers
mick
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 13, 2011, 11:16:48 AM
hey pier

dont forget to include me for 1 x IO board and 1 x Ge DOA.

cheers
mick

just done
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 13, 2011, 12:50:05 PM
Total noob question.
 What is the exact purpose of this pultec I/O board. Please educate me. How is this different from the g- pultec boards I have? is that even a valid question?

Cheers,
Chris


the section, that does the equalization function inside the pulteq eq1a, needs input and makeup/out stages.
My IO board gives an input stage and a makeup/out stage for the passive eq stage of the pulteq eq1a.

The original pulteq eq has only tubes on makeup/out stage.

I have designed a board to have these input and out stage based on solid state technology with DOA's and/or IC opamps.

Moreover, to use the Ian Bell pulteq eq inductorless version is needed a fet buffer stage to use bipolar trasistors IC, so my IO board has a fet buffer stage for this.

some my customers are going to use both the makeup stages : solid state (my IO board) stage and the tube (Ian Bell) stage.



 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: radiance on May 13, 2011, 03:05:57 PM
Since the first 18 boards I have ordered will be to me in 7-10 days, I can accept the first payments, i have just sent a message to the first ones who have ordered the boards

thanks
regards
Pier Paolo



Ok, I've received your PM.

What's your Paypal address and what are the shipping costs to France for 4 IO +2 PSU boards?

Thanks..
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 13, 2011, 03:18:45 PM
Since the first 18 boards I have ordered will be to me in 7-10 days, I can accept the first payments, i have just sent a message to the first ones who have ordered the boards

thanks
regards
Pier Paolo



Ok, I've received your PM.

What's your Paypal address and what are the shipping costs to France for 4 IO +2 PSU boards?

Thanks..

the total is calculated as following:

4x IO boards = 4x 12  = 48 euro
2x PSU2 PCB's =2x 5   = 10 euro
S&H  to France (registered mail service) = 9 euro
paypal fees 3%
-----------------------------------------------
TOTAL  69 euro

my paypal address are being sent with message to you.

thanks
kind regards
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on May 13, 2011, 04:47:57 PM
Pier, I'm gonna need a psu board as well  :)

+1 PSU Board

Thanks for the explanation.

Chris
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ChrioN on May 13, 2011, 07:37:00 PM
Excellent! Could you add the pcb to the first post or is the boards a work in progress?
Sorry if this is obvious, I haven't read through the thread.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: creal on May 14, 2011, 05:03:00 PM
Hi Pier
I need your paypal address and the total price for payment

2x APP2050 Germanium = 2 x 38e = 76 euros
4x IO boards = 4x 12  = 48 euros
2x PSU2 PCB's =2x 5   = 10 euros
S&H  to France (registered mail service) = 9 euros
paypal fees 3%
total= 147,29 euro (148 euros)

it's correct for you?
Best
Cyril
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 14, 2011, 05:22:26 PM
Hi Pier
I need your paypal address and the total price for payment

2x APP2050 Germanium = 2 x 38e = 76 euros
4x IO boards = 4x 12  = 48 euros
2x PSU2 PCB's =2x 5   = 10 euros
S&H  to France (registered mail service) = 9 euros
paypal fees 3%
total= 147,29 euro (148 euros)

it's correct for you?

yes, pm sent
Best
Cyril

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: creal on May 15, 2011, 06:00:21 AM
Hi Pier,

Paypal'ed and Pm'ed this morning

Cyril
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 15, 2011, 06:18:52 AM
Hi Pier,

Paypal'ed and Pm'ed this morning

Cyril

thanks
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Tubemooley on May 18, 2011, 08:01:54 AM
Yo...... I'm glad I checked in on this thread. I'm not visiting Prodigy regularly right now because I end up spending too much money. But I still want these I/O boards. Pier - Have you sent me an invoice? If not, please do. I will send you an e-mail from my dayjob address in a few minutes. Four I/O boards at 12EUR each and two PSU2's at 5EUR each plus shipping to east coast USA. Eedley. Oodley. Thanks, DANA.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 18, 2011, 09:42:23 AM
Yo...... I'm glad I checked in on this thread. I'm not visiting Prodigy regularly right now because I end up spending too much money. But I still want these I/O boards. Pier - Have you sent me an invoice? If not, please do. I will send you an e-mail from my dayjob address in a few minutes. Four I/O boards at 12EUR each and two PSU2's at 5EUR each plus shipping to east coast USA. Eedley. Oodley. Thanks, DANA.
 

When I have launched the group buy in the ruffrecord's thread and I have ordered 20 IO board pcb's to the PCB factory (in that time I have not supposed all these orders). For the other 100 pcb's I will order them after I have tested the first 20. They will be soon to me, just some days (4-6 days I think), but I need one or two days to test them and than I will order the second stock of boards for the other members.

 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: desol on May 18, 2011, 08:03:12 PM
Hi Pier,

Do you have an update of the order list?

Thanks
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: radiance on May 27, 2011, 09:17:34 AM
I've paypalled you the 13th of May but so far I've not received anything. Should I be worried?
I mean, a package send from Italy to France should not take long right?
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 27, 2011, 09:20:59 AM
I've paypalled you the 13th of May but so far I've not received anything. Should I be worried?
I mean, a package send from Italy to France should not take long right?

No, the PCB's are just arrived to me today , today I will post a photo.
First sending them I should test them , so I keep a few of days 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: radiance on May 27, 2011, 10:35:00 AM
ok cool...
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Winetree on May 27, 2011, 12:28:15 PM
I'm getting 2 sets of inductor boards, 4 total.
I need how many of the in/out boards? and power supply(s)?
Invoice me for that many.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 28, 2011, 02:12:31 PM
I'm getting 2 sets of inductor boards, 4 total.
I need how many of the in/out boards? and power supply(s)?
Invoice me for that many.

you need 4 io boards,

regarding the PSU , it depends if you use DOA's, and if you use them, it depends of the quiescent currents of them and the quantity.

Just to be more precise, the boards can accept until two DOA's , but you could use even one DOA for each io board in the output/make up stage and use an IC opamp in the input stage.
However considering 2 DOA's for each io board, one PSU only can supply power to 4 boards, but the LM317/337 must have good heatsinks. 



 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Citrus Hill on May 28, 2011, 05:30:58 PM
Hi Pier,
I'd like to purchase 10 pultec i/o boards and 5 psu2 boards.  can you let me know what the total would be in USD? 
Thanks,
Rob Mc.


11x10=110 euro (io board) , 5x5=25 (Psu2)    total = 135 euro that are 193.5 USD
shipping costs are unknown bacause I don't know the weight yet but with registered mail service might be in range 12.75 euro = 18 USD , Prices are indicative because they have to be recalculated at time of payment for the variable quote of USD.

I have done 11 euro pc being 10 boards

thanks
cheers
Pier Paolo

Hi Pier,
Can you send me an invoice for these if you are ready?
Thanks,
Rob Mc.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 29, 2011, 03:57:30 PM
I am testing the boards , I cannot accept other orthers before having testing them.
however, I have tested the output/makeup and it works fine.
I am testing the input section to be precise.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Grooveteer on May 30, 2011, 02:46:40 AM
Hi Pier,

Can I change my order to 4 I/O boards (was 2) and 2 PSU boards (was 1)?

Many thanks.

Cheers,
Grooveteer
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 30, 2011, 04:53:23 AM
Hi Pier,

Can I change my order to 4 I/O boards (was 2) and 2 PSU boards (was 1)?

Many thanks.

Cheers,
Grooveteer

yes, you can.

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Matthew Jacobs on May 30, 2011, 06:49:56 AM
Hello Pier

Sorry, I haven't checked this thread in a while.

Can I add 2 PSU to my order please?

Regards
JD
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 30, 2011, 09:01:26 AM
Hello Pier

Sorry, I haven't checked this thread in a while.

Can I add 2 PSU to my order please?

Regards
JD

yes, you can do it
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on May 30, 2011, 05:22:34 PM
the board run fine so I am going to ship them,

at this point for the second stock very soon I am going to accept the payments ( I have had to test them)

thanks
best regards
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 02, 2011, 05:19:55 PM
this is the prototype after some tests.

now is tested.

I can accept other payments for the new stock.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: leadbreath on June 02, 2011, 05:59:08 PM
hey pier

nice one, do u have any news on the Ge DOA??

mick
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on June 03, 2011, 07:17:50 AM
Hi,

Could you please send me all the info on how much, where to pay etc etc.
My order was 2x IO   1x PSU

Cheers
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 03, 2011, 07:59:29 AM
hey pier

nice one, do u have any news on the Ge DOA??

mick

just 10-15 days and they will be ready to go,

cheers
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 04, 2011, 07:01:23 AM
the io board group buy upgraded

4   Creal   + 2 DOA's germanium + 2 PSU boards shipped
4   Matthew Jacobs
2   Mylesgm   + 2 DOA's germanium
4   Radiance  + 2 PSU boards      shipped
2   ilfungo + 2 PSU boards    shipped
2   tzman + 1 PSU boards     shipped
4   Albrebreton + 4 PSU boards paid
2   ruairioflaherty +1PSU kit paid
2   chrispbass  + 1 PSU boards   shipped
6   0dbfs + 3 PSU boards paid
4   Grooveteer + 2 PSU boards paid
4   benlindell + 4 PSU boards + 4 LED VU  shipped
1   leadbreath + 1 germanium doa
4   Tubemooley  + 2 PSU boards paid
2   Songguy +1 psu pcb
2   desol    + 1 psu board  paid
2   Andreas Pfeiffer + 1 PSU board
2   Davo + 1 PSU board
4   Michael Tibes + 4 psu boards  paid
2   lejeunes03 +2 psu +2 Ge DOA
2   ej_whyte + 1 PSU paid
10  Citrus Hill + 5 psu boards paid
2   noulou
2   kepeb
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Albrebreton on June 04, 2011, 08:07:53 AM
Hi Pier, what's your Paypal address and what are the shipping costs to Spain for 4 IO +4 PSU boards?
Thank you.
Alberto.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: 0dbfs on June 04, 2011, 08:11:13 AM
Hi Pier, If you can notate the total due and your pp address I would like to send payment asap.

Thanks!
jb
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 04, 2011, 09:07:48 AM
Hi Pier, what's your Paypal address and what are the shipping costs to Spain for 4 IO +4 PSU boards?
Thank you.
Alberto.

Hi Alberto,

your parcel is circa 380 gr. so the S&H with registered mail is 13.5 euro.
I am going to send you the paypal address via PM.

thanks
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 04, 2011, 09:19:47 AM
Hi Pier, If you can notate the total due and your pp address I would like to send payment asap.

Thanks!
jb


the total is the following:

6x io boards= 6x12 euro = 72 euro

3x PSU2 PCB's = 3x5 euro = 15 euro

S&H to USA with registered mail (weight = circa 500 gr.) =  18.5 euro
--------------------------------------------------------------------
total   105.5 euro

total with paypal fees = 109.19 euro =          159.67 USD



 

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: 0dbfs on June 04, 2011, 09:35:11 AM
Hi Pier, If you can notate the total due and your pp address I would like to send payment asap.

Thanks!
jb


the total is the following:

6x io boards= 6x12 euro = 72 euro

3x PSU2 PCB's = 3x5 euro = 15 euro

S&H to USA with registered mail (weight = circa 500 gr.) =  18.5 euro
--------------------------------------------------------------------
total   105.5 euro

total with paypal fees = 109.19 euro =          159.67 USD
Payment sent.
Thanks Pier!

Best,
jonathan
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on June 04, 2011, 09:43:05 AM
Pier,

Can you add 2 more I/o boards and 1 psu board to my order before I paypal you?

That would be TOTAL 4 I/o and 2 Psu boards.

Thanks,
Chris
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 04, 2011, 10:48:08 AM
Pier,

Can you add 2 more I/o boards and 1 psu board to my order before I paypal you?

That would be TOTAL 4 I/o and 2 Psu boards.

Thanks,
Chris

ok
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: desol on June 04, 2011, 10:57:32 AM
Hi Pier,

I'd like to change my order to 2 - i/o boards and 1 psu. I need the paypal address, shipping, etc. Thk u.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 04, 2011, 02:30:38 PM
Hi Pier,

I'd like to change my order to 2 - i/o boards and 1 psu. I need the paypal address, shipping, etc. Thk u.

PM sent
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ruairioflaherty on June 04, 2011, 03:37:43 PM
Hi Pier,

Payment sent.  Thank you kindly.

Cheers,
Ruairi
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Albrebreton on June 04, 2011, 03:43:10 PM
Payment sent.
Thank you, Pier
Alberto.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: mylesgm on June 04, 2011, 10:41:01 PM
Hi Pier,  Can you pm me total for my order and paypal address?  Cheers
Myles
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Grooveteer on June 05, 2011, 07:56:01 AM
Hi Pier,

Same here, please PM with total and Paypal addy.

Thanks!



EDIT:  Paid.  Thanks again!
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on June 05, 2011, 10:15:51 AM
I still haven't got a PM with my total and where to pay?

Thanks
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 05, 2011, 12:54:38 PM
I still haven't got a PM with my total and where to pay?

Thanks

scuse me, pm sent

Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on June 05, 2011, 04:48:14 PM
OK, i'm all paid up. Any idea on a rough shipping date?

Thanks
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 05, 2011, 05:41:44 PM
thanks for payment,


regarding lead time, is this:

- a few of days days to permit the other group buy menber to pay, I am going to order 60 pcs to PCB factory and 60 pcs
   cost a bit.  

- 8 - 12 days max for the PCB factory to make the boards (but i think 8 days)

- the time to ship them , just 5-7 days max (but I think 5 )

- 1 or two days to for me to ship them to you (however in these days I am going to prepare the parcels to ship)
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on June 05, 2011, 06:31:51 PM
OK thanks that all sounds cool. I'll keep checking the status on here of when you ship them etc, but if it gets too late i will have to change my delivery address, as im moving house on the 9th of July.

Looking forward to the boards, thanks
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ilfungo on June 10, 2011, 06:11:45 AM
Grazie Pier
oggi sono arrivate le schede
GRANDE LAVORO!!!
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: mylesgm on June 10, 2011, 10:58:55 PM
paid up too.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: leadbreath on June 11, 2011, 08:55:04 AM
hey pier

i need to update my order with another Ge DOA and a psu, bringing the total to:

1 x IO PCB
1 x PSU PCB
2 x Ge DOA's

cheers
mick
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: creal on June 11, 2011, 10:20:35 PM
Hi Pier
the four IOboards and the PSU arrived in my box.
Looks very nice, now waiting for the Ge DOAs ;)

Cheers
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Michael Tibes on June 12, 2011, 10:48:19 AM
If it's not too much effort, could you pm me (or just write it here) my total costs as well (shipping to germany)?

Thanks a lot,

Michael
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 12, 2011, 01:55:25 PM
If it's not too much effort, could you pm me (or just write it here) my total costs as well (shipping to germany)?

Thanks a lot,

Michael

the total is the following:

4x io board = 4 x12 = 48 euro
4x psu pcb = 4 x 5 =  20 euro
S&H to Germany with registered mail service = 13 euro  (the parcel should be around 400 gr.)
======================================================================
total      = 81 euro

total with paypal fees = 83.83 euro



thanks
best regards
Pier Paolo

PS: attached a photo of the io board
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 12, 2011, 03:18:07 PM
the trasformer's hole is to make an 1U gear
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Michael Tibes on June 13, 2011, 03:41:58 PM
Paid up, thank you again  :)

Michael
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: leadbreath on June 13, 2011, 06:42:15 PM
hey pier

paypal sent
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: radiance on June 15, 2011, 04:13:14 AM
Hey Pier,
Received my boards today. They look great!
However, I',m missing 1 psu board. I've ordered 2 right?
I tried PM-ing you about this but your inbox is full.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: kepeb on June 15, 2011, 12:27:07 PM
hi pier,
I noticed by coincidence when checking for a response to my earlier question, my name is on your list although I have never asked for any boards?? I'm not yet building a pultec.

My original request was to find out if you will be stocking these permanently in the future.
cheers.

how many is that up to now?
will you be stocking these after the groupbuy?
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Matthew Jacobs on June 16, 2011, 06:19:34 AM
Hi Pier

If possible, could you also let me know how much I need to pay you as well?

Thanks

JD
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Tubemooley on June 16, 2011, 06:59:55 AM
Pier - Just wondering if you have shipped to DANA in USA? No chomp. Just wondering. Thanks, DW.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 17, 2011, 05:09:41 AM
Hey Pier,
Received my boards today. They look great!
However, I',m missing 1 psu board. I've ordered 2 right?
I tried PM-ing you about this but your inbox is full.


scuse me for the mistake, i will send it or I will refund you the money (5 euro)

Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 17, 2011, 05:17:12 AM
hi pier,
I noticed by coincidence when checking for a response to my earlier question, my name is on your list although I have never asked for any boards?? I'm not yet building a pultec.

My original request was to find out if you will be stocking these permanently in the future.
cheers.

how many is that up to now?
will you be stocking these after the groupbuy?

I am going to cancel from group buy

kind regards
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 19, 2011, 01:55:31 PM
Hi Pier

If possible, could you also let me know how much I need to pay you as well?

Thanks

JD

the price is

4x12 =48 euros io boards
s&H with registered mail service 13.5 euros
===============================
total  61.5 euros

total with paypal fees= 63.64 euros
 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: radiance on June 22, 2011, 06:46:54 AM
Hey Pier,
Received my boards today. They look great!
However, I',m missing 1 psu board. I've ordered 2 right?
I tried PM-ing you about this but your inbox is full.


scuse me for the mistake, i will send it or I will refund you the money (5 euro)

Pier Paolo

Refund is ok....or if you've already send it, that's also ok. Whatever you like best. Thanks again!
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: 0dbfs on June 24, 2011, 08:12:31 PM
Hey Pier, Just wondering when you expect to ship the IO boards and PSU boards if you have not already started. Also wondering if you have a parts list or something. I've got to make a mouser order for some other stuff and wanted to get this in too.

Thanks Man!

Cheers,
jb
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 25, 2011, 06:08:35 AM
Hi JP,

I am just waiting the IO boards from PCB factory,  they will ship them to me on 27th this month.
For having the best price to forum members, I have ordered these boards with a large manufacturing time (12 euro pc for this board is very cheap).
Regarding the BOM and schematic I will post them very soon.

cheers
Pier Paolo
  
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 25, 2011, 06:02:13 PM
this is the io board's list of components
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 25, 2011, 06:17:49 PM
and this is the io board's circuitry
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on June 28, 2011, 08:00:10 AM
.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 29, 2011, 09:46:55 AM
I need to change my delivery address because i'm moving house next week. My order was for 2 IO boards and 1 PSU, and the paypal email address was [email protected]
The new address will be:

Elliott Whyte,
Flat 32,
Parade Mansions,
Watford Way,
Hendon,
London,
NW4 3JJ

Cheers

ok just upgrated

cheers
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on June 29, 2011, 09:49:03 AM
to contact me by email use the following email address please:

pier.paolo.abbate( at )gmail( dot )com

thanks
cheers
Pier Paolo 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: creal on June 29, 2011, 10:52:21 AM
Hi Pier Paolo,

Any news about the Germanium DOAs?

thx
Cyril
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: lejeunes03 on July 01, 2011, 10:25:57 AM
2x12= 24 euro  io
2x 5= 10 euro  psu
2x 38 = 76 euro ge
s&H = 10 euro registered mail
======================
tootal 120 euro

total with paypal fees =  123.6 euro

hello,
i've paypaled 123.6 euro and have no news from the shipping.
have the packaege been shipped?
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 01, 2011, 11:54:49 AM
the io boards are just arrived to me from the pcb factory, so I have as the io boards as the PSU boards too, but I haven't yet the GE DOA ready to go out, but i think to have the ge doa ready to go soon.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: muffy1975 on July 07, 2011, 01:16:51 PM
HI,

can I order a PSU from you for my classic audio api? need +16 -16v and 48v. is a 15va 18v 18v transfomer enough?

regards

micahel de a
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 07, 2011, 02:25:38 PM
yes , you can

15va 18v 18v transfomer goes well for one or two channels.


cheers
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Holger on July 08, 2011, 02:14:03 PM
Pier Paolo, can you update me here on the shipping progress regarding my meter boards? I'd paid June 12.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 08, 2011, 05:24:54 PM
your parcel is ready to go out

cheers
Pier Paolo

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on July 11, 2011, 04:53:37 PM
Hi PPA,
Money sent.
Thanks,
Chris
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Michael Tibes on July 14, 2011, 07:03:39 AM
Hi Pier,

I was wondering when you expect to ship the remaining boards?

Cheers,

Michael
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 14, 2011, 07:24:41 AM
I have sent several parcels two days ago , I am  just going to upgrade the group-buy list.

cheers
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on July 14, 2011, 08:18:25 AM
Hi PPA,
Money was sent for as discussed:
4 I/O boards
2 PSU boards

You have me down for 2 on the list?
Cheers,
Chris
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Holger on July 15, 2011, 05:32:37 AM
Received the meter boards today, thanks. Can you send me the schematics?
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Tubemooley on July 21, 2011, 06:39:54 AM
I received my order two days ago. The boards look fantastic. Update your list (for yourself)..... DANA (tubemooley) has received his order. Thanks Pier. DW.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 22, 2011, 01:05:08 PM
thanks Dana for your comments

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Davo on July 23, 2011, 01:25:39 AM
Hi Pier,

Just got my boards as well... excellent quality!!  Thanks

Cheers,
Dave
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: lejeunes03 on July 25, 2011, 03:58:31 AM
Hi Pier,
have you any news from the DOA for my command.
did they arrive soon?
thanks
Sébastien
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ruairioflaherty on July 26, 2011, 08:46:26 PM
Hi PPA,

Just a note to let you know I received my boards.  Thank you.

Is there a support/build/schematics thread for this board?

Cheers,
Ruairi
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: 0dbfs on July 26, 2011, 08:50:28 PM
I received mine too!

Thanks Pier!

Cheers,
jb
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 27, 2011, 02:34:40 AM
Hi PPA,

Just a note to let you know I received my boards.  Thank you.

Is there a support/build/schematics thread for this board?

Cheers,
Ruairi

yes, I have intention to open one

cheers
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 27, 2011, 02:35:56 AM
Hi Pier,
have you any news from the DOA for my command.
did they arrive soon?
thanks
Sébastien

In this time I was sick, but don't worry I wil send it to you.
cheers
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 27, 2011, 02:38:39 AM
Hi Pier,

Just got my boards as well... excellent quality!!  Thanks

Cheers,
Dave

thank you very much for your comments
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on July 27, 2011, 03:27:58 PM
 :)
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 27, 2011, 05:12:13 PM
I still haven't received my boards (UK), what was the estimated shipping time meant to be?
Anyone else in the UK got theirs yet?

Cheers

I have sent your boards with the others, but seem that the americans have received their parcels first the english members (!?) 
However, I think your parcel is next to arrive to you.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: lejeunes03 on July 28, 2011, 02:45:43 AM
In this time I was sick, but don't worry I wil send it to you.
cheers
Pier Paolo
hello, i don't worry , i've just waiting for some news.
Take care of yourself.
Sébastien
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Albrebreton on July 28, 2011, 04:35:39 AM
I have sent several parcels two days ago , I am  just going to upgrade the group-buy list.

cheers
Pier Paolo


Hi Pier, I feel you have been sick, just want to know if my boards have been sent (I´m not hurry, just want to know). I didn't find the upgraded group-buy list (the list is in the 25 page isn't it?)
Best regards, and take care of yourself.
Alberto
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 28, 2011, 05:35:30 AM
I have sent several parcels two days ago , I am  just going to upgrade the group-buy list.

cheers
Pier Paolo


Hi Pier, I feel you have been sick, just want to know if my boards have been sent (I´m not hurry, just want to know). I didn't find the upgraded group-buy list (the list is in the 25 page isn't it?)
Best regards, and take care of yourself.
Alberto

yes, your parcel have been sent the previus week so it is next to be arrived.
thanks
regs
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: radiance on July 28, 2011, 08:19:19 AM
Hey Pablo,
Hope all's well. Did you send me my missing PSU board yet?
best,

Roland
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 28, 2011, 08:33:55 AM
Hey Pablo,
Hope all's well. Did you send me my missing PSU board yet?
best,

Roland

yes,
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: leadbreath on July 28, 2011, 11:27:31 AM
hey pier

i just checked the update list and u havent marked me up as paid/shipped??

payment sent via paypal on the 13/06 ???

please let me know.

cheers
mick
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on July 28, 2011, 01:28:11 PM
Pier,

I sent you payment on or before July 14 for 4 I/O boards and 2 PSU boards as per our PM. I also left note earlier on this thread about the payment I sent.

On the list you still have me down for 2 I/O and 1 PSU and no payment?

Please contact me.
Chris
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: leadbreath on July 28, 2011, 05:09:52 PM
i also just noticed u just got me down for 1x I/O PCB and 1 x GE DOA?

i actually paid for 1 x I/O PCB, 2 x GE DOA and I x PSU PCB as per invoice u sent??

can u please sort this out???

mick
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on July 28, 2011, 06:06:11 PM
 
Hi pier,
I sent that payment to you on the 11th of July

Details:

Jul 11, 2011   Payment For Pier Paolo Abbate    Completed    ...   -€79.52 EUR 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 29, 2011, 01:57:24 PM

Hi pier,
I sent that payment to you on the 11th of July

Details:

Jul 11, 2011   Payment For Pier Paolo Abbate    Completed    ...   -€79.52 EUR

your parcel was sent a week ago
kind regards
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 29, 2011, 02:02:25 PM
the io board group buy upgraded

4   Creal   + 2 DOA's germanium + 2 PSU boards,  shipped
4   Matthew Jacobs,   shipped
2   Mylesgm   + 2 DOA's germanium,  paid,  shipped
4   Radiance  + 2 PSU boards,      shipped
2   ilfungo + 2 PSU boards,    shipped
2   tzman + 1 PSU boards ,    shipped
4   Albrebreton + 4 PSU boards, shipped
2   ruairioflaherty +1PSU kit, shipped
2   chrispbass  + 1 PSU boards,   shipped
6   0dbfs + 3 PSU boards paid, shipped
4   Grooveteer + 2 PSU boards, shipped
4   benlindell + 4 PSU boards + 4 LED VU,  shipped
1   leadbreath + 2 germanium doa, paid
4   Tubemooley  + 2 PSU boards, shipped
4   Songguy +2 psu pcb, shipped
2   desol    + 1 psu board,  shipped
2   Andreas Pfeiffer + 1 PSU board, shipped
2   Davo + 1 PSU board shipped, paid
4   Michael Tibes + 4 psu boards,  shipped
2   lejeunes03 +2 psu +2 Ge DOA, paid
2   ej_whyte + 1 PSU paid,  shipped
10  Citrus Hill + 5 psu boards, paid, shipped
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: noulou on July 29, 2011, 02:09:45 PM
My apologies Paolo, I think I will have to skip this one.  :(

Please wipe me off the list.

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on July 29, 2011, 02:14:51 PM
Thanks Pier!
It must be a challenge to keep track of all these orders.
Thanks again.
Chris
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: leadbreath on July 29, 2011, 04:01:04 PM
pier, just to confirm, i paid for 1 x I/O, 1 x PSU and 2 x Ge DOA's.

can u please update list??
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 29, 2011, 05:35:16 PM
My apologies Paolo, I think I will have to skip this one.  :(

Please wipe me off the list.

done
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: creal on July 29, 2011, 06:55:42 PM
Hi Pier Paolo,

Any news about the Germanium DOAs?

thx
Cyril

Hi Pier,

I still waiting for the 2 x GE DOAs?
I recived the IO board and the PSU but not the GE DOAs.

I saw the status is (shipped) in the last update.
Do you send the 2 DOA's germanium today?

Best,
Cyril
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: mylesgm on July 30, 2011, 07:12:45 AM
I just received a paypal refund for the 2 Ge opamps.  Whats the problem?

M
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on July 30, 2011, 01:02:20 PM
I just received a paypal refund for the 2 Ge opamps.  Whats the problem?

M

as precaution  I can not put the epoxy resin (for my health), I am sorry, it is not a decision I made readily as you can guess.  I have refund the money to the other customers in the list who have ordered them. 
scuse me
kind regards
Pier Paolo

 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: creal on July 30, 2011, 07:49:20 PM
I just received a paypal refund for the 2 Ge opamps.  Whats the problem?

M

idem for me???
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on August 05, 2011, 01:55:03 PM
.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on August 05, 2011, 04:58:24 PM
I am going to check it,

Who has received his parcel? please.

in the UK?

thanks
kind regards
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: desol on August 05, 2011, 05:34:26 PM
Haven't received mine either... ???
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Michael Tibes on August 06, 2011, 05:33:18 AM
Paid up, thank you again  :)

Michael

I still haven't received mine either :(

Michael
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on August 06, 2011, 11:59:02 AM
I am sorry, but I am not responsible for the postal service, but if the for the next week these parcels will be not arrived I will resend new ones  ;)

Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on August 06, 2011, 03:05:17 PM
 ;)
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: mylesgm on August 06, 2011, 10:48:44 PM
I haven't received mine either.  I'm in australia.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on August 07, 2011, 04:27:58 AM
I haven't received mine either.  I'm in australia.

your parcel had just been sent on 4th this month so it is a bit too early to receive it.  8)

Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on August 07, 2011, 04:38:39 AM
..........is also important for me to know who has received his parcel so I can update the group-buy list, please.

Thanks.

Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Citrus Hill on August 13, 2011, 01:23:31 AM
Hi Pier,
I haven't received mine yet either.  I'll post when they show.
Thanks.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on August 13, 2011, 04:48:08 AM
Hi Pier,
I haven't received mine yet either.  I'll post when they show.
Thanks.
ok, thanks
your parcel had just been sent on 4th this month , usually the shippings for USA keep 5-14 days
depending the destinations.
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: mylesgm on August 14, 2011, 02:41:55 AM
mine arrived a couple of days ago.  Cheers
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Michael Tibes on August 17, 2011, 07:33:22 AM
Paid up, thank you again  :)

Michael

I still haven't received mine either :(

Michael

Still nothing here... When did you ship mine actually? I can hardly believe it takes so long to just cross the alps.

Michael
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on August 17, 2011, 02:48:47 PM
Paid up, thank you again  :)

Michael

I still haven't received mine either :(

Michael

Still nothing here... When did you ship mine actually? I can hardly believe it takes so long to just cross the alps.

Michael

At this point I am making another parcel for you now.

Pier Paolo


Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Grooveteer on August 17, 2011, 03:24:32 PM
Hi Pier,

I have not received my PCBs yet either.  I'm in no hurry, so let's give it some time. Maybe the'll show up.

Cheers,

Grooveteer
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on August 17, 2011, 03:28:59 PM
Hi Pier,

I have not received my PCBs yet either.  I'm in no hurry, so let's give it some time. Maybe the'll show up.

Cheers,

Grooveteer

I suspect that all parcels sent in the same day were missed.
Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Albrebreton on August 18, 2011, 05:51:51 AM
Hi Pier,
No, I didn't receive your boards yet either.
Thank you for your attention.
Alberto
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Tubemooley on August 19, 2011, 06:42:31 AM
I am just adding my two cents today. As we all know, Pier and the other guys in the White Market are each running a business. I see that Pier's DOA offerings have changed slightly. I find it hard to keep track of these 30 pages threads and all. So here's my summary. This is just the DOA's. Plus shipping, of course.

APP2050 ver.6.0 Very low noise high class A DOA.
30 euros each for 1 to 2 pcs.

APP2050E ver.4.0 Very high class A DOA.
34 euros each for 1 to 3 pcs.

APP2055 ver.2.0 Class A ultra-low noise FET DOA
34 euros each for 1 to 4 pcs.

Pier - You are on my list to purchase several of these. I have at least two other DOA orders to place first. I have to spread out my purchases in order to minimize the pain on my bank account. Your stuff looks killer as usual. Thanks, DANA.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ruairioflaherty on August 20, 2011, 03:36:39 AM
Has the schematic for the I/O board been posted somewhere?  I can't find it.  If there's a parts list that would be great too but not vital.

I want to get mine up and running.

Thanks,
Ruairi
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on August 20, 2011, 05:10:09 AM
Has the schematic for the I/O board been posted somewhere?  I can't find it.  If there's a parts list that would be great too but not vital.

I want to get mine up and running.

Thanks,
Ruairi

yes, the schematic and the parts list are posted here at:
http://www.groupdiy.com/index.php?topic=33576.520
for any qustion tell me, please.

Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on August 20, 2011, 05:12:40 AM
I am just adding my two cents today. As we all know, Pier and the other guys in the White Market are each running a business. I see that Pier's DOA offerings have changed slightly. I find it hard to keep track of these 30 pages threads and all. So here's my summary. This is just the DOA's. Plus shipping, of course.

APP2050 ver.6.0 Very low noise high class A DOA.
30 euros each for 1 to 2 pcs.

APP2050E ver.4.0 Very high class A DOA.
34 euros each for 1 to 3 pcs.

APP2055 ver.2.0 Class A ultra-low noise FET DOA
34 euros each for 1 to 4 pcs.

Pier - You are on my list to purchase several of these. I have at least two other DOA orders to place first. I have to spread out my purchases in order to minimize the pain on my bank account. Your stuff looks killer as usual. Thanks, DANA.

thanks Dana
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on August 20, 2011, 06:19:19 AM
Hi Pier,
No, I didn't receive your boards yet either.
Thank you for your attention.
Alberto
at this point I am sending another parcel.

Pier Paolo
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on August 21, 2011, 11:39:25 AM
I am just adding my two cents today. As we all know, Pier and the other guys in the White Market are each running a business. I see that Pier's DOA offerings have changed slightly. I find it hard to keep track of these 30 pages threads and all. So here's my summary. This is just the DOA's. Plus shipping, of course.

APP2050 ver.6.0 Very low noise high class A DOA.
30 euros each for 1 to 2 pcs.

APP2050E ver.4.0 Very high class A DOA.
34 euros each for 1 to 3 pcs.

APP2055 ver.2.0 Class A ultra-low noise FET DOA
34 euros each for 1 to 4 pcs.

Pier - You are on my list to purchase several of these. I have at least two other DOA orders to place first. I have to spread out my purchases in order to minimize the pain on my bank account. Your stuff looks killer as usual. Thanks, DANA.

regarding my products I have developed another DOA derived from APP2050 topology.
This new opamp has a single-ended topology for the voltage amplifier section, seem it sounds better than the original schematic. At this point, maybe, the APP2050 , APP2050E and APP2055 will be out of production soon, but they will be replaced by this one. The price will be strong competitive. 

 

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on August 24, 2011, 02:19:05 PM
 :)
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: desol on August 24, 2011, 06:13:00 PM
Tracking number would be good Pier. Not sure of shipment ETA...

Still waiting...

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: radiance on September 03, 2011, 03:28:18 AM
Hey Pablo,
Hope all's well. Did you send me my missing PSU board yet?
best,

Roland

yes,

Hey Pablo,

I feel sorry to say this but I still have not received the PSU board.
I'm not in a hurry or so but it's been more than a month now...
Do you have news on this?

best,

Radiance
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Songguy on September 03, 2011, 09:30:38 AM
Pablo,
I too have received nothing after a month.
Chris
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on September 03, 2011, 10:34:11 AM
Pablo,
I too have received nothing after a month.
Chris

Chris, at this point PM me your address and your order so I will send another parcel the next week, please.

thanks
Pier Paolo
 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on September 03, 2011, 10:38:28 AM
Tracking number would be good Pier. Not sure of shipment ETA...

Still waiting...

The parcel is not tracked in Canada. The postal office said me that are needed two month to know if a parcel is missed in Canada, but it's too time.

I have a new parcel just ready to go for the next week as the other 4.

Pier Paolo

Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on September 03, 2011, 10:40:57 AM
a new parcel is ready to go out to your new address
Pier Paolo  :)
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on September 03, 2011, 10:45:33 AM
Paid up, thank you again  :)

Michael

I still haven't received mine either :(

Michael

Still nothing here... When did you ship mine actually? I can hardly believe it takes so long to just cross the alps.

Michael

a new parcel is ready to be sent out in the next week  :)

Pier Paolo 
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on September 04, 2011, 07:39:15 AM
.
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Grooveteer on September 04, 2011, 10:45:09 AM
Hi Pier,

Just to let you know; I have not received my boards either.  :'(

Cheers,

Grooveteer
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: radiance on September 09, 2011, 06:45:08 AM
I got my PSU board today.
Many thanks!!
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Grooveteer on September 12, 2011, 09:46:40 AM
Hi Pier,

I got my boards today. Thank you!
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ej_whyte on September 13, 2011, 02:50:12 PM
Hi Pier,

The boards arrived while i was on holiday last week. Thanks for all your work.

Cheers
Elliott
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: desol on September 22, 2011, 06:48:42 PM
Hi Pier

I got my boards very fast this time..  ???

Thanks!  :)
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Dubka on September 23, 2011, 11:06:54 AM
Could someone please explain why there is no option for an input transformer?
Cheers
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on September 23, 2011, 04:20:29 PM
Could someone please explain why there is no option for an input transformer?
Cheers


thanks for the good call, so I can expose some my choises.

There are the following reasons:

My goal was to permit easily to use an 1U rack chassis for the PULTEQ EQ, because to save space in a recording studio is important today, so the sound engineers can have 4 or 6 or 8 pulteq eqs in a reasonable space. 
Many out trasformers must be placed horizontally in a 1U rack chassis but is not so easy to do it. Considering that several opamps (IC and DOA's) doesn't work at +-24V to have an output level equal or better than 24dbu, an out trasformer (used in 1:2 config) is necessary to have this headroom.
So the chance to mount easily an out trasformer onboard was a "must" for me.
Yes, there are some DOA's that work at +-24V but I wanted that forum members could to use an +-16V DOA too, or, if needed, an IC opamp in place of it.
I have included an space onboard for the out trasformer only to mount it easily, not for other reasons.

An input trasformer can not be mounted vertically onboard inside an 1U rack chassis and it is very hard to mount onboard it horizontally (speaking for an 1U rack chassis), there are several input trasformers wired that can be mounted horizontally near to the input of the eq section with ties or screws, for example some Sowter xfrs can be mounted easily vertically on the 1U chassis's bottom panel using screws , some wired cinemag xfrs can be mounted horizontally inside a 1U rack chassis using plastic ties and connect it with its wires.

The second reason is the board's cost.
To include an output trasformer in the board was an added cost, but, since it was necessary for the above reason I decided to include it.
Regarding an input trasformer zone I decided to exclude it because it was not necessary as the output trasformer so I wanted to avoid a cost that for many customers maybe is only a cost, although actually it is important having it onboard when an input trasformer is needed , but we  keep in mind that it's possible having it onboard not for 1U chassis and however an input trasformer can be placed outboard.
I would add that the out trasformer zone onboard is a cost added of 30% of theboard's  total cost.
   
The 3th reason is that many commercial gears have only active unbalanced inputs for cost reductions. Input trasformers cost more and more than active unbalanced inputs, often the commercial gears have a simple section based on IC opamp or an dedicated IC  in place of a trasformer. This section usually cost even 10 times less than a trasformer.
When I designed the board I considered even the option for the customer to have a cheap input section. A good option is an IC based input section and a DOA based out section with trasformer or trasformerless, perhaps even when the customer has just other 4 pulteq eq based on this board. The 3th reason seems to be similar to the 2nd, but it is not the same, because I wanted even to remake a thing that is become a "must" in the recording studio gears, that's the active input section.  This is important to remake a "sound look" feature at the eq that's in many famous commercial gears' sound now. 
However, the customer can mount an input trasformer outboard if he prefer it for having an old style sound.
I would like to add that my board is not in any case an cheap/low performances board, several solutions used are better than in expensive commercial gears, I permit myself to say without offence nobody. For example the input section uses a my new schematic without electrolityc caps.


cheers
Pier Paolo



Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Dubka on September 25, 2011, 11:23:35 AM
Cheers for that mate.
I'm in for 2 boards. How much are they?
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on September 25, 2011, 02:01:18 PM
I should make new prices, but since you have asked before I have made them,I apply to you the old prices. These prices are the same of the group buy,  12 euro each PCB so the total with shipping to UK with registered mail service is:

2x12 = 24 euro
S&H = 8.5 euro
===========
total 34.5

total with paypal fees (3.5%) = 35.7 euro

cheers
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: Michael Tibes on September 27, 2011, 06:06:14 AM
Paid up, thank you again  :)

Michael

I still haven't received mine either :(

Michael

Still nothing here... When did you ship mine actually? I can hardly believe it takes so long to just cross the alps.

Michael

a new parcel is ready to be sent out in the next week  :)

Pier Paolo

Hi Pier,

I received the boards 10 days ago, thanks again for your effort - they do look great  :)

What happened actually, I hope you didn't lose a whole shipment?

Cheers,

Michael
Title: Re: IO board for PULTEQ EQ (inductor and inductorless version) GROUP BUY - APP DOA's
Post by: ppa on September 27, 2011, 11:44:35 AM

Hi Pier,

I received the boards 10 days ago, thanks again for your effort - they do look great  :)

What happened actually, I hope you didn't lose a whole shipment?

Cheers,

Michael

I have a small suspicion on it , but are needed two months to know it.
I have sent a lot of parcels, very often these ones arrived to their destinations, some no (a few).
But the problem is August. In Italy in August a lot of people are in holiday (90%), so in August there were days with one postal clerk only in the front office of the postal office where I send the parcels, and those near it. But this year many italian have continued to send parcels the same (to family and friends) because many have reduced the duration of their travels or have eliminated totally them for the strong italian economic crisis. However, if these parcel are lost I am entitled to a refund from the postal office.
Moreover, this summer seems that a lot a lot of tax assessments were sent against the sicilian companies creating difficulties in sending parcels and mails. Italians are stressed by the very high italian taxes and the very complicated italian fiscal system that's much more complex than that of other countries.
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886
Post by: tmuikku on September 27, 2011, 12:48:25 PM
Hi Pier Paolo!

I'm interested in the Piccolo amp boards. I coudn't find any info with search and your site seems to be under construction as well. Could you tell some more? I guess there is much info in the Internets about gainclone but could you give some details? I'm planning to revive old 3 way speakers that have failing amps and no replacement parts available. The active crossovers are still good so all I need is 3 amps per speaker around 50-100W. thanks!

-T
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886
Post by: ppa on September 27, 2011, 03:43:06 PM
Hi Temu,

my amp card vs. the original gainclone card has added an RF filter , an optional decupling cap, a zobel net on out and a PSU card on board so the amp become very compact. For the PSU you should add the power supply trasformer only. You can use the same power trasformer for all gainclone cards. Moreover I have modified some resistor values for best THD and bw response.
This card can give 50W on 8 ohm and 68 on 4 ohm. It sound very good, better, in my opinion vs. the original project.
(http://home.teletu.it/APPSI/piccolo%2022%20009%20b.JPG)


For higher power I sell an mosfet amp card with 100W on 8 ohm and 180W on 4 ohm with better sound performances. I have just developed it on this summer. This card has discrete topology and has the power supply caps on board to save space. It has very powerful basses (impressive), extremely fast transients and a trasparence sound look.

Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886
Post by: ppa on September 27, 2011, 03:55:31 PM
regarding the Piccolo amp I have the PCB and the psu caps (very cheap price and high quality) just available and ready to go out. Moreover, I have the LM3886T (strip metal case) at only 5 euro pc for 4-6 pcs.   

these the prices
APP studio ing PICCOLO  PCB only:

one pc: 8 euros each plus S&H and paypal fees.
from 2 to 4 pcs= 6 euros plus S&H and paypal fees.
from 5 to 6 pcs= 5.5 euros plus S&H and paypal fees.
from 7 to 10 pcs= 5 euros plus S&H and paypal fees.



for the mosfet amp card I am waiting the PCB's even if I have the most important components available.
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: tmuikku on September 28, 2011, 05:01:48 AM
Thanks for details, the amps seems to be of great value as usual! I have to check out what the existing mains transformers are capable of and get back to you later this autumn.
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: dingo on October 08, 2011, 10:33:11 AM
hello! Pierpaolo
here same picture of my summing mixer done with your IO boards ,doa, fet in boards
IO boards are used for master section  and for some input
app2050,app 2055 ,melcor 1731 ,2520bc doa used
for input  your class A fet board
in total are 24 channels organized in 4 mono channels-4 mono chan. with pan pot-8 stereo input
3 stereo buss  , inserts on 16 channels, meter buffer, out transformer option on master buss
sound fantastic,clean,dynamic, very satisfied  :)

thanks Pierpaolo  for your help !! ;)

(http://i108.photobucket.com/albums/n39/ingosch/SP_A0405.jpg)

(http://i108.photobucket.com/albums/n39/ingosch/SP_A0406.jpg)

(http://i108.photobucket.com/albums/n39/ingosch/SP_A0403.jpg)

(http://i108.photobucket.com/albums/n39/ingosch/SP_A0402.jpg)

(http://i108.photobucket.com/albums/n39/ingosch/SP_A0407.jpg)
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ej_whyte on October 13, 2011, 05:15:36 PM
Hi Pier,

Are your Germanium DOAs still available? If not, any plans to stock them again?

Cheers
Elliott
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on October 14, 2011, 04:35:06 PM
Hi Pier,

Are your Germanium DOAs still available? If not, any plans to stock them again?

Cheers
Elliott

I am replacing a new stock , so i think to finish them soon.

cheers
Pier Paolo
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: radiance on October 21, 2011, 11:34:08 AM
Hi Pier,
Hope all's well. Sorry if this has been answered already, but can you explain the FET buffer part of the IO board?
For example, should I use this when the connecting the gain make up opamp to a passive EQ filter like the Pultec? See attached...disregard the tube section...
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on October 21, 2011, 01:01:56 PM
Hi Pier,
Hope all's well. Sorry if this has been answered already, but can you explain the FET buffer part of the IO board?
For example, should I use this when the connecting the gain make up opamp to a passive EQ filter like the Pultec? See attached...disregard the tube section...

Hi,

this FET buffer has the function to give an very high load to the stage connected to the input of the out stage/balancer of the IO board. 
I have insert this fet buffer stage to permit to use the version without inductor of the Pulteq EQ designed by Ruffrecord that needs a 
For the classic inductor based Pulteq EQ the fet buffet is not required because this EQ does not need an vry high input, so the impedance of the out stage/balancer of the IO board goes well in this second case.
BTW I am going to open a support thread for the IO board.

PLEASE ALL , tell me for questions.


Pier Paolo


 


Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: radiance on October 21, 2011, 01:30:54 PM
Thanks!
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: radiance on October 28, 2011, 05:49:09 AM
Any specific reason for the on-board regulators (U3 & U4) being 12V?
It seems I can use 15V ones as well Right?

And what are the jumpers W1 and W2 for?
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on October 28, 2011, 12:27:40 PM
Any specific reason for the on-board regulators (U3 & U4) being 12V?

the only reason is that if you use +-Vcc of +-16V or +-15V you cannot use 15V regulators, but since the opamps used in the servo circuits can be powered with +-12V as well, these 12V regulators are however right.

It seems I can use 15V ones as well Right?

only if you use +-Vcc equal or greater of 18V you can use the 15V regulators   

And what are the jumpers W1 and W2 for?

many IC opamps can run properly with max supply voltages under or equal +-15V or +-18V,
if you use +-24V of power supply the regulators have the function of to make lower this power supply voltages so the IC opamps used in the servos can run properly as well.
In the case you use power supply voltages for the io board under the max values rated for these IC opamps, you can avoid to populate the IC regulators inside the board.
These jumpers connect the Vcc pins of the IC opamps used as DC servos  directly to the power supply connector of the io board, so you can power these ones with the same +-Vcc used for the board avoiding IC regulators   

 
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: radiance on October 28, 2011, 12:43:33 PM
??  ;D
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on October 28, 2011, 12:49:09 PM
Any specific reason for the on-board regulators (U3 & U4) being 12V?

the only reason is that if you use +-Vcc of +-16V or +-15V you cannot use 15V regulators, but since the opamps used in the servo circuits can be powered with +-12V as well, these 12V regulators are however right.

It seems I can use 15V ones as well Right?

only if you use +-Vcc equal or greater of 18V you can use the 15V regulators   

And what are the jumpers W1 and W2 for?

many IC opamps can run properly with max supply voltages under or equal +-15V or +-18V,
if you use +-24V of power supply the regulators have the function of to make lower this power supply voltages so the IC opamps used in the servos can run properly as well.
In the case you use power supply voltages for the io board under the max values rated for these IC opamps, you can avoid to populate the IC regulators inside the board.
These jumpers connect the Vcc pins of the IC opamps used as DC servos  directly to the power supply connector of the io board, so you can power these ones with the same +-Vcc used for the board avoiding IC regulators   

 
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: radiance on October 28, 2011, 12:52:44 PM
Thanks! I'll use the 15V ones then.
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on October 28, 2011, 01:36:52 PM
Thanks! I'll use the 15V ones then.

However, I writing a manual for the io board
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on October 29, 2011, 10:25:33 AM
just to say that I have launched a support thread for the IO board  here http://www.groupdiy.com/index.php?topic=46320.0

 ;D

Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: gemini86 on October 29, 2011, 05:50:48 PM
Hi Pier,

I'm right to assume the gainclone amp card is the PCB, only, right? Just checking...
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on October 29, 2011, 06:31:17 PM
Hi Pier,

I'm right to assume the gainclone amp card is the PCB, only, right? Just checking...


I can sell the components too,  the matter is I have written only the PCB's price.
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: tmuikku on November 16, 2011, 07:26:04 AM
Hi Pier Paolo!

how is the MOSFET amp going, did you get boards for it? What requirements for mains transformer and what voltage rails the MOSFET amp requires?

I've got two 160VA toroids that are powering +-35v rails in the amps they are currently in and wonder if I could reuse them for MOSFET mono blocks.
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on November 17, 2011, 06:27:06 PM
I have just the PCB's


the toroidals are fine for two monoblock
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on November 17, 2011, 06:31:27 PM
these boards have the PSU capacitors onboard so they need only a diodes bridge and an  trasformer
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: zayance on November 19, 2011, 02:44:44 PM
Your PM's are full, i wanted to have some informations, thanks a lot.
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: Cormacrestrike on December 08, 2011, 03:35:36 AM
Hi
I'm just about to embark on my first project building a 4 channel version of ruffrecords PMEQP1 and I'm on the hunt for gain make up and PSU options.

The I/O board looks like a good match for make-up and output for the EQ circuit so I just wanted to check if the PSU2 could potentially provide power for 4 of the boards if matched with an appropriate power transformer?

Many thanks
Cormac
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on December 08, 2011, 03:39:43 PM
Hi
I'm just about to embark on my first project building a 4 channel version of ruffrecords PMEQP1 and I'm on the hunt for gain make up and PSU options.

The I/O board looks like a good match for make-up and output for the EQ circuit so I just wanted to check if the PSU2 could potentially provide power for 4 of the boards if matched with an appropriate power transformer?

Many thanks
Cormac

Hi,

yes, the PSU2 can provide power for the 4 IO boards you need, but the IC regulators inside it need a good heatsink (that is not a problem).
I have just only 4 IO boards available, for the PSU2 boards I have them in quantity.

thanks
cheers
Pier Paolo



 
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: Cormacrestrike on December 08, 2011, 06:01:57 PM
Hi Pier
that's great, cheers. Can you put me down for 4 IO boards and a PSU2 kit to go with them. I'll PM you my details.
cheers
Cormac
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: christinafoulds on December 13, 2011, 08:15:37 AM
Dear Pier,

Is it possible to place an order for one APP2050E?
I am new here and was not sure how this webpage system works?
Writing this from Tokyo.

Christina
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on December 13, 2011, 05:16:53 PM
Dear Pier,

Is it possible to place an order for one APP2050E?
I am new here and was not sure how this webpage system works?
Writing this from Tokyo.

Christina

Hi Christina,

I have only an APP2050 (normal version) available,
However, I am replacing a 2050E stock.

Pier Paolo
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: xjazzwreck on December 14, 2011, 11:54:19 AM
Hi Pier,

Any idea when the 2050e will be back in stock. I have been wanting to pick up a pair for awhile now.

Thanks,
keith
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: cstella on December 17, 2011, 03:11:01 PM
Hi Pier

I am looking for 2 to 4 APP2055's. Are they available?

Thanks, Charles
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: johnny dance on February 15, 2012, 08:29:57 AM
Hi Pier, Pm'd re 2050 (or E's)

are there any more coming up for sale soon?

JD
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: dingo on February 25, 2012, 02:08:45 PM
Hello!Pierpaolo! ;D
here some pictures about your germanuim preamp app1060
it is a prototype pcb 
very nice sounding  preamp a good alternative to api style preamp!!!!
sound great on guitars- vox - bass....also for overhead drum

(http://i108.photobucket.com/albums/n39/ingosch/SP_A0419.jpg)

(http://i108.photobucket.com/albums/n39/ingosch/SP_A0410.jpg)

(http://i108.photobucket.com/albums/n39/ingosch/SP_A0436.jpg)

thank you!!
dingo.

Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on February 25, 2012, 06:23:13 PM
thanks


Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on February 25, 2012, 06:25:25 PM
here the nw app studio ing opamp

app2065



(http://home.teletu.it/APPSI/APP2065%20(1).jpg)
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on March 31, 2012, 12:42:47 PM
NEW PREAMP MIC

the APP Studio Ing. MA1

this is the prototype, just an image made with the cellphone.


(http://home.teletu.it/APPSI/MA1_4_.JPG)



this preamp is not a 312 style preamp but a new one.


Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: Winetree on May 17, 2012, 06:48:37 PM
You e-mailed me.
Your PM is full
How do I respond?
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on May 18, 2012, 03:26:38 AM
You e-mailed me.
Your PM is full
How do I respond?

Hi,
my PM is ready now.

Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: hop.sing on May 24, 2012, 03:52:07 PM
Hi Pier Paolo

The APP992 (Are they identical with your APP2065?) opamps arrived. We are impressed! Beautiful performance in Igors sontec, we upgraded from old signetics 5534s, a very noticable improvement! No measurable distortion in your opamp at sane levels, but a somehow rich and deep sound compared to the signetics. Great.
I have to admit, it is my first experience with changing a 5534 (or any other chip) to a discrete opamp.

Best Tobias
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP1040
Post by: ppa on May 25, 2012, 12:15:12 PM
Hi Pier Paolo

The APP992 (Are they identical with your APP2065?) opamps arrived. We are impressed! Beautiful performance in Igors sontec, we upgraded from old signetics 5534s, a very noticable improvement! No measurable distortion in your opamp at sane levels, but a somehow rich and deep sound compared to the signetics. Great.
I have to admit, it is my first experience with changing a 5534 (or any other chip) to a discrete opamp.

Best Tobias

thanks for your comments,
yes, app992 is very similar to app2065, the app2065 has bipolar transistors in the front end, so it uses the same 992 PCB.   
Now, I have developed another opamp called app2060 that's a FET input opamp


Title: Re: APP STUDIO ING - MA1 GERMANIUM / SILICON DISCRETE MIC PREAMP ON 500 RACK
Post by: ppa on June 02, 2012, 02:19:21 PM
NEW  MIC/DI PREAMP


APP Studio Ing.  MA1

this mic pre uses both a germanium and some silicon transistors. I have designed this gear to have the sound of germanium with the dynamic and the fast transients of my opamps.
The germanium transistor is placed in the best point to make sound.
MA1 is for 500 rack chassis and operates at 16V of power.
I have used with success the classic api trasformers and I council you them very much.

(http://home.teletu.it/APPSI/MA1_2_2.JPG)


(http://home.teletu.it/APPSI/MA1_8_2.JPG)

It is an outstanding preamp, a studio recording in Italy has an MA1 and has registered a video using it, just to listen the voice registered with the MA1:

http://www.youtube.com/watch?v=Nqr9ABICNuQ

I could do a group buy for a kit if there is sufficient quantity of people interested on.

Actually I have some PCB's and some chassis and all semiconductors, since some MA1's are just sold in Italy and in USA. But if there are several people interested I can order other chassis and PCB's and doing sale prices for the group buy.

Thanks for looking.


Title: Re: APP STUDIO ING - MA1 GERMANIUM / SILICON DISCRETE MIC PREAMP ON 500 RACK
Post by: 3nity on June 02, 2012, 11:16:25 PM
How much can a channel cost?
Please let me know!
Thanks
Title: Re: APP STUDIO ING - MA1 GERMANIUM / SILICON DISCRETE MIC PREAMP ON 500 RACK
Post by: ppa on June 03, 2012, 03:52:32 AM
Hi,

Actually, I can offer a basic kitset with the following parts:

- PCB
- front panel (full worked)
- L-bracket  (full worked)
- all semiconductors included in the project(onsemi and semelab), leds are included.
- stand-offs, screws.


the following other components are available from classicapi:

- input trasformer
- output trasformer
- potentiometer
- knob
- swicthes
- push buttons

the preamp can use several trasformers (some of Classicapi, Cinemag, Jensen, Altran and Lundhal)
I have used classicapi trasformers inside the preamp and it got very high performances so I council them very much.

the basic kit prices are the following:
 
1 kit is 85 euro + shipping + paypal fees

2 kits are 150 euro + shipping + paypal fees

4 kits are 250 euro + shipping + paypal fees


thanks for inquiry
kind regards
Pier Paolo
Title: Re: APP STUDIO ING - MA1 GERMANIUM / SILICON DISCRETE MIC PREAMP ON 500 RACK
Post by: [silent:arts] on June 03, 2012, 05:25:23 AM
Pier, one for me please  8)
Title: Re: APP STUDIO ING - MA1 GERMANIUM / SILICON DISCRETE MIC PREAMP ON 500 RACK
Post by: mylesgm on June 03, 2012, 07:21:44 AM
I'll take 2 Germ preamps. M
Title: Re: APP STUDIO ING - MA1 GERMANIUM / SILICON DISCRETE MIC PREAMP ON 500 RACK
Post by: ppa on June 03, 2012, 09:54:30 AM
I'll take 2 Germ preamps. M


PM sent
thanks
kind regards
Title: Re: APP STUDIO ING - MA1 GERMANIUM / SILICON DISCRETE MIC PREAMP ON 500 RACK
Post by: okgb on June 03, 2012, 10:46:10 PM
the germ pre looks exciting  , I've been meaning to order a couple of your germ opamps
so looks like I'll have to put an order together
Title: Re: APP STUDIO ING - MA1 GERMANIUM / SILICON DISCRETE MIC PREAMP ON 500 RACK
Post by: ppa on June 04, 2012, 12:01:48 AM
the germ pre looks exciting  , I've been meaning to order a couple of your germ opamps
so looks like I'll have to put an order together

many thanks for comments,

sorry, but regarding the APP2050GE , even if they had success, I have put them out of production from a while because they needed too hard work.

kind regards
Title: Re: APP STUDIO ING - MA1 GERMANIUM / SILICON DISCRETE MIC PREAMP ON 500 RACK
Post by: ppa on June 04, 2012, 12:11:24 AM
since I have only some pcs, I would want to say that, to avoid misunderstandings, priority is given with payment.

kind regards
Title: Re: APP STUDIO ING - MA1 GERMANIUM / SILICON DISCRETE MIC PREAMP ON 500 RACK
Post by: ppa on June 06, 2012, 01:27:17 AM
all preamp kits sold

I am waiting for new stock.

Title: Re: APP STUDIO ING - MA1 GERMANIUM/SILICON DISCRETE MIC PREAMP - ALL ITEMS SOLD
Post by: Kingston on June 10, 2012, 05:27:25 PM
I did some DOA comparisons. I have several different types of ppa opamps so I thought other people here might be interested.

http://www.groupdiy.com/index.php?topic=27972.msg618444#msg618444

The new APP992 opamp is amazing. Someone building mastering gear should perhaps check it out.
Title: Re: APP STUDIO ING - MA1 GERMANIUM/SILICON DISCRETE MIC PREAMP - ALL ITEMS SOLD
Post by: Winetree on June 10, 2012, 07:46:54 PM
Pier,
Received the Kits and CAPI parts. Waiting for 2nd package.
Please send Docs.
Check your E-mail and clear PM box.
Title: Re: APP STUDIO ING - MA1 GERMANIUM/SILICON DISCRETE MIC PREAMP - ALL ITEMS SOLD
Post by: ppa on June 11, 2012, 02:49:38 PM
I did some DOA comparisons. I have several different types of ppa opamps so I thought other people here might be interested.

http://www.groupdiy.com/index.php?topic=27972.msg618444#msg618444

The new APP992 opamp is amazing. Someone building mastering gear should perhaps check it out.


thanks very much for your comments,



Title: Re: APP STUDIO ING - MA1 GERMANIUM/SILICON DISCRETE MIC PREAMP - ALL ITEMS SOLD
Post by: ppa on June 11, 2012, 02:50:46 PM
Pier,
Received the Kits and CAPI parts. Waiting for 2nd package.
Please send Docs.
Check your E-mail and clear PM box.

I have sent the docs to your email

kind regards
Title: Re: APP STUDIO ING - MA1 GERMANIUM/SILICON DISCRETE MIC PREAMP - ALL ITEMS SOLD
Post by: Winetree on June 11, 2012, 05:06:24 PM
PM sent
Title: Re: APP STUDIO ING - APP992 - NEW
Post by: Winetree on June 18, 2012, 02:01:19 AM
What value is R8?
Not listed in MA1 BOM.
Title: Re: APP STUDIO ING - APP992 - NEW
Post by: ppa on June 18, 2012, 05:38:17 AM
What value is R8?
Not listed in MA1 BOM.

sorry for the value missed in the BOM , R8 is 10k , 1/4W, 1%, metal film (however it can be 5% carbon film for who loves the old carbon film resistors' sound)

PM with the new BOM sent
Title: Re: APP STUDIO ING - APP992 - NEW
Post by: kilmister on June 20, 2012, 02:00:28 PM
Hi Pier.

Sent you mail few days ago, haven't recive answer yet. Have you got my mail?

Cheers,
Paavo
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP104
Post by: Dr Gris on June 30, 2012, 05:30:22 AM

[/quote]

thanks for your comments,
yes, app992 is very similar to app2065, the app2065 has bipolar transistors in the front end, so it uses the same 992 PCB.   
Now, I have developed another opamp called app2060 that's a FET input opamp
[/quote]

I' m sorry, I' m a bit confused about all your DOA´s right now. Is the APP992 the only one in stock at the moment?
I would like to buy two opamps for my upcomming build: http://www.groupdiy.com/index.php?topic=46920.0
Do you think these will fit this application? In the build thread they say I might need a feedback cap if it has high DC offset (in this case a JLM99V opamp), what do you think?

Kind regards
Magnus
Title: Re: IO board - PSU2 - LED METER - APP DOA's - GAINCLONE AMP CARD LM3886 - APP104
Post by: ppa on June 30, 2012, 12:48:52 PM
thanks for your comments,
yes, app992 is very similar to app2065, the app2065 has bipolar transistors in the front end, so it uses the same 992 PCB.   
Now, I have developed another opamp called app2060 that's a FET input opamp

I' m sorry, I' m a bit confused about all your DOA´s right now. Is the APP992 the only one in stock at the moment?
I would like to buy two opamps for my upcomming build: http://www.groupdiy.com/index.php?topic=46920.0
Do you think these will fit this application? In the build thread they say I might need a feedback cap if it has high DC offset (in this case a JLM99V opamp), what do you think?

Kind regards
Magnus

thanks for the question.
APP992 is the only opamp I have stocked at this time.
APP992 is a very good opamp for many eqs for its high slew rate of 75V/uS and its very high BW
and for its very high stability.

Mitsos has just PM me,
Yes, I think APP992 runs on Mitsos's eq without any mod. If you decide to buy it from me and If it doesn't run in the Mitsos's eq I will refund you the money for the 992's you will buy from me.  :).


kind regards
Pier Paolo



 


 
Title: Re: APP STUDIO ING - APP992 - NEW
Post by: Dr Gris on June 30, 2012, 07:50:38 PM
Hi Pier,

thank you very much for your great offering. That is very kind of you!!
Since I' ve read so much good things about your opamps I really want to buy two APP992' s from you.
Even if I would have to mod the EQ circuit it wouldn' t be too much hassle.
All of your earlier opamps have caught my attention for a while so this new APP992 seems very exciting!!
I will contact you by PM or mail or you can email me if you' d like.

Sinceramente
Magnus
Title: Re: APP STUDIO ING - APP992 - KITSET VERSION AVAILABLE -
Post by: ppa on July 29, 2012, 05:16:04 PM

a photo of MA1 mic preamp with new PCB.

(http://home.teletu.it/APPSI/MA1%20photo2.JPG)
Title: Re: APP STUDIO ING - APP992 - KITSET VERSION AVAILABLE -
Post by: okgb on July 29, 2012, 11:24:16 PM
Will the preamp be available as a kit ? and will you post when the germanium opamps
are back in stock ?
Title: Re: APP STUDIO ING - APP992 - KITSET VERSION AVAILABLE -
Post by: ppa on July 30, 2012, 08:53:30 AM
Will the preamp be available as a kit ? and will you post when the germanium opamps
are back in stock ?

yes, I will sell the preamp as a kit and mounted.
I am waiting some components to make the kits.
The kit is a partial kit and it will have all components except the trasformers and the switches.

Yes, I will post when the new germanium DOA will be ready to sale.
Title: Re: APP STUDIO ING - APP992 - KITSET VERSION AVAILABLE -
Post by: Rellister on August 02, 2012, 05:21:38 PM
Hi Pier,
some questions about your APP PSU - (maybe it should be posted elsewhere?)

I´m learning by doing, so sorry for newbie questions.
Is a 30VA 2x18V enough for powering 4x312-style pres running at 16V, in addition to 48V?
I don´t understand how the PSU makes +48V from this toroid- but I can see that theres no input for a +48V secondary.
LM317 is only specced to about +37V. Will it be able to handle +48V?
I also want to pretrim the trimmers so I´m not that far off when powering up, but I cant seem to calculate the right values - since LM317 needs more than 10K to make 48V when R6 is 332ohm according to schematic.

Thanks
Rune
Title: Re: APP STUDIO ING - APP992 - KITSET VERSION AVAILABLE -
Post by: ppa on August 04, 2012, 05:04:50 AM
Hi Pier,
some questions about your APP PSU - (maybe it should be posted elsewhere?)

I´m learning by doing, so sorry for newbie questions.
Is a 30VA 2x18V enough for powering 4x312-style pres running at 16V, in addition to 48V?
I don´t understand how the PSU makes +48V from this toroid- but I can see that theres no input for a +48V secondary.
LM317 is only specced to about +37V. Will it be able to handle +48V?
I also want to pretrim the trimmers so I´m not that far off when powering up, but I cant seem to calculate the right values - since LM317 needs more than 10K to make 48V when R6 is 332ohm according to schematic.

Thanks
Rune

Hi Rune,

a 30VA 18Vx2 transformers is a good for 4x312 style preamp.

Regarding the +48V , PSU2 , as many PSU for mic preamp, has an internal voltage multiplier section to generate this voltage from a much lower AC voltage from the trasformer.

Regarding the LM317, that voltage value of 37V is relative to the difference of the V input and the V out at the relative input and out pin of the LM317.
I have designed the PSU2 to have this difference always under 30V (also in the OFF-ON transition).
 
Title: Re: APP STUDIO ING - APP992 - KITSET VERSION AVAILABLE -
Post by: ppa on August 04, 2012, 07:07:22 AM
II also want to pretrim the trimmers so I´m not that far off when powering up, but I cant seem to calculate the right values - since LM317 needs more than 10K to make 48V when R6 is 332ohm according to schematic.

Thanks
Rune

using R6= 12.5 kohm you have +48.6V , but the advantage of the trimmer is to get the exact value of +48V. The matter is that without trimmer the +48V out is subjected to the 5% of tollerance of the LM317's reference voltage and , moreover at the 1% of tollerance of the resistors.
However, these tollerance are limit values, so, in the real case, probably you will get a value very near to +48.6V. At this point I council you to test the PSU2 phanthom voltage out with no trimmer and using the 12.5 k resistor. If this value is good you can leave the PSU as it is.   

Please, consider that output phanthom gives power to expensive microphones too, for this reason I have put a trimmer inside the circuit to set the exact value of +48V, just to be clear.

 


Title: Re: APP STUDIO ING - APP992 - KITSET VERSION AVAILABLE -
Post by: Rellister on August 05, 2012, 03:36:56 PM
Hi Pier,

thanks for a good explanation :D
Title: Re: APP STUDIO ING - APP992 - KITSET VERSION AVAILABLE -
Post by: Dr Gris on August 05, 2012, 04:47:41 PM
Hi Pier,

the APP992's you sent me are amazing. Makes my new eq' s sound very refined with beautiful transient preservation.
Boosting the highs are so smooth silky.

Kind regards
Magnus
Title: Re: APP STUDIO ING - APP992 - KITSET VERSION AVAILABLE -
Post by: dingo on August 07, 2012, 07:07:47 AM
hello!Pierpaolo

here some picture with your preamp. MA1
sharing api lunchbox 6B with other preamp.
this MA1 sounds wery good 
on vocals,guitars ,overheads drum,bass, etc. etc.
very nice sounding  preamp and a good alternative to api style preamp!!!

(http://i108.photobucket.com/albums/n39/ingosch/IMG_20120401_122018.jpg)
(http://i108.photobucket.com/albums/n39/ingosch/IMG_20120401_122036.jpg)
thanks!!
Dingo.
Title: Re: APP STUDIO ING - APP992 - KITSET VERSION AVAILABLE -
Post by: Rellister on August 18, 2012, 11:30:22 AM
Pier,

please check your gmail.

Title: Re: APP STUDIO ING - APP992 - KITSET VERSION AVAILABLE -
Post by: KrIVIUM2323 on August 23, 2012, 01:43:19 PM
Hello PPA,

you've got a pm.  :D

Best regards.
Title: Re: APP STUDIO ING - APP992 - KITSET VERSION AVAILABLE -
Post by: kante1603 on September 01, 2012, 05:44:35 AM
Pm sent for APP992 order.

Best regards,

Udo
Title: Re: APP STUDIO ING - MA1 GERMANIUM mic -di pre , kits available -
Post by: SubhumanRecords on September 05, 2012, 07:37:00 PM
I would love 1 kit please...
Title: Re: APP STUDIO ING - MA1 GERMANIUM mic -di pre , kits available -
Post by: ppa on September 06, 2012, 02:30:12 PM
I would love 1 kit please...

PM sent
Title: Re: APP Studio Ing's products
Post by: dubwarrior on September 11, 2012, 05:00:42 AM



IO board   

--> boards available



This high performances board can be used for many circuits to give them a balanced input and output (with makeup stage) when it is needed.

The IO Board is an input-output card, so it has an input section to unbalance signals from gears and a make-up stage to balance  signals from unbalance sources. Moreover, the IO board has an high impendance FET buffer to interface the make-up stage to very high impedance sources if required.

These very high performances input and out stage are both based on solid state technology and they can run with DOA's and/or IC opamps, so the customer can use many DOA's and IC opamps in the market.
Moreover, the out section has a zone for an output trasfomer to place easily it in 1U rack chassis, just using two screws. Can be used several trasformers (cinemag, jensen, classicapi) on it.

IO board can use all APP DOA's and many other DOA's as 2520, JE990 , JLM99....etc....
so you can choise the sound look basing on the DOA's (or IC opamps).

Just to note that it is also possible use the buffer plus the make-up stage as very high performance instrument amplifier with trasformerless or trasformer coupled out.
By the way it is possible use this board as line amplifier too, or both instrument and line amp.



(http://home.teletu.it/APPSI/io%20board%20100b.JPG)

IO board has a new design for the input stage that does not use any electrolytic cap but only small 1uF polyester caps and a servo DC stage.
Moreover, a servo DC is present in the make-up stage too, to avoid any capacitor on input-output and in the nfb net.

This board was sold in a recent group buy with success so I would like to re-propose it to the market for who want a modern in-out interface.  I have launched a support thread for the IO board  here http://www.groupdiy.com/index.php?topic=46320.0

 




How much gain those you IO boards have?

regards

rico
Title: Re: APP Studio Ing's products
Post by: ppa on September 11, 2012, 09:53:38 AM

 How much gain those you IO boards have?

regards

rico

46 dB max.

Pier Paolo
Title: Re: APP Studio Ing's products
Post by: dubwarrior on September 11, 2012, 10:08:03 AM
Thanks

Thats alot, even enough for a Phono preamp with a passive RIAA filter..

regards

rico
Title: Re: APP Studio Ing's products
Post by: ppa on September 11, 2012, 03:31:31 PM
Thanks

Thats alot, even enough for a Phono preamp with a passive RIAA filter..

regards

rico

I am just designing a phono preamp using two APP992's.

Pier Paolo








Title: Re: APP Studio Ing's products
Post by: dubwarrior on September 11, 2012, 04:30:59 PM
Thanks

Thats alot, even enough for a Phono preamp with a passive RIAA filter..

regards

rico

I am just designing a phono preamp using two APP992's.

Pier Paolo

That sounds great  :D

Any Idea when its available?

So i canbuild a preamp for my home HiFi system, with 1 IO Board for CD-Player and with the new(or with the IO and RIAA Filters) phono pre, and a switch..
Then some transformers in the output, a dream come true

 :D :D ;D ;D

Regards

Rico
Title: Re: APP Studio Ing's products
Post by: ppa on September 11, 2012, 05:42:17 PM
Yes, with two io boards is possible to make a complete hifi line preamp with balanced or unbalanced inputs and outputs.
Regarding the phono preamp I think that for this weekend I should having designed  it,
The phono preamp uses two servos to avoid caps in the signal path, so there are no caps from input to out. My APP992 (and APP2055) has a very low noise and it suitable for MC phono preamps.

Pier Paolo
 
Title: Re: APP Studio Ing's products
Post by: dubwarrior on September 11, 2012, 06:21:47 PM
This sound great.

exactly what im looking for to build the phone/line pre-amp.

let me know when some pcbs are available, do you sell them here?

Regards

Rico
Title: Re: APP Studio Ing's products
Post by: dubwarrior on September 18, 2012, 08:27:08 AM
Hy Paolo

Any news abut your phono pre?  ;D

Do you have any recommendations for transformars for the IO Board?


cheers

Rico
Title: Re: APP Studio Ing's products
Post by: ppa on September 18, 2012, 05:10:37 PM
Hy Paolo

Any news abut your phono pre?  ;D

Do you have any recommendations for transformars for the IO Board?


cheers

Rico


I have just designed the schematic and I going to design the PCB.
After I will have done to design this PCB I will order some PCB for prototyping , at this point, if this phono preamp runs fine, I could give you two of these ones. 

kind regads
Pier Paolo

Title: Re: APP Studio Ing's products
Post by: dubwarrior on September 18, 2012, 05:33:35 PM
Hy Paolo

Any news abut your phono pre?  ;D

Do you have any recommendations for transformars for the IO Board?


cheers

Rico


I have just designed the schematic and I going to design the PCB.
After I will have done to design this PCB I will order some PCB for prototyping , at this point, if this phono preamp runs fine, I could give you two of these ones. 

kind regads
Pier Paolo

that would be really generous  :D :D :D

About the Line IO boards
Do you have any transformer recommendations?

regards

Rico
Title: Re: APP Studio Ing's products
Post by: pidah on September 19, 2012, 09:40:59 AM
Just want to say that a Pier Paulo designed phone pre sounds very interesting to me. Very interesting indeed!

cheers,
Pieter
Title: Re: APP Studio Ing's products
Post by: ppa on September 19, 2012, 04:36:55 PM
Hy Paolo

Any news abut your phono pre?  ;D

Do you have any recommendations for transformars for the IO Board?


cheers

Rico

I have just designed the schematic and I going to design the PCB.
After I will have done to design this PCB I will order some PCB for prototyping , at this point, if this phono preamp runs fine, I could give you two of these ones. 

kind regads
Pier Paolo

that would be really generous  :D :D :D

About the Line IO boards
Do you have any transformer recommendations?

regards

Rico

regarding the phono pre I am working on PCB design yet.

regarding trasformers fro I/O boaed there is the following suggested:

-    CMOB-2H
-    CMOB-2L
–   CINEMAG CMOQ-2S
–   CINEMAG CMOQ-2L
–   CINEMAG CMOQ-2H
–   CLASSIC API EA2503
http://classicapi.com/catalog/product_info.php?cPath=21_37&products_id=79
–   JENSEN TRASFORMERS  JT-11SS-DLCF
–   JENSEN TRASFORMERS JT-123-ALCF

for clear sound I suggest you the CINEMAG CMOQ-2H, CMOB-2H,  JENSEN TRASFORMERS JT-123-ALCF, JENSEN TRASFORMERS  JT-11SS-DLCF.


kind regards
Pier Paolo




Title: Re: APP Studio Ing's products
Post by: ppa on September 19, 2012, 04:39:04 PM
Just want to say that a Pier Paulo designed phone pre sounds very interesting to me. Very interesting indeed!

cheers,
Pieter

thanks for you interest.
work is in progress  :)
 
Pier Paolo
Title: Re: APP Studio Ing's products
Post by: kante1603 on September 29, 2012, 11:57:43 AM
Hello Pier,

APP992's received in germany today.
And thank you very much for the gift you've added.Must think about a nice way to use it now,hahaha...

Best regards,

Udo. ;)
Title: Re: APP Studio Ing's products
Post by: dingo on October 19, 2012, 09:06:44 AM
hello Pierpaolo ;D
here some photo with my new equalizer
made with your boards   IO board for input and output,APP992 doa, APP PSU, and filter boards
four bands parallel eq PARAMETRIC shelving, variable  Q on all bands ,low and high bands variable q in bot mode
variable gain  +- 9db   +-16db
clean sound very musical and usable , for mixing, tracking,and mastering!!
thank you Pier.

(http://i108.photobucket.com/albums/n39/ingosch/eq3.jpg)
(http://i108.photobucket.com/albums/n39/ingosch/eq2in.jpg)
(http://i108.photobucket.com/albums/n39/ingosch/eq1.jpg)



Title: Re: APP Studio Ing's products
Post by: [silent:arts] on October 19, 2012, 09:46:50 AM
 8)
Title: Re: APP Studio Ing's products
Post by: kante1603 on October 19, 2012, 11:41:51 AM
Hello dingo,

a really nice piece of gear you have there,congratulations!
Most of it seems to be italian,that's a modushop case with pierced inner base,right?

Have fun with it,

cheers,

Udo :)
Title: Re: APP Studio Ing's products
Post by: dingo on October 19, 2012, 01:29:52 PM
Yes, it is made with an italian chassis and it uses all italian boards by
APP studio ing. (also the filter boards are APP studio ing.).

Pier Paolo designed this eq in these months, and since this eq's features
exciting to me I have asked to Pier to build one.

So, at this point, Pier sent to me the filter boards and the other boards.

This eq does passively the sum of the out signal from the filter boards,
moreover it is possible to set the q of the filter boards also in shelving
mode, that's very useful.
The filter boards use SVF filter topology. "

Title: Re: APP Studio Ing's products - APP2050 AND APP2050E READY TO SEND OUT
Post by: brennyb on November 01, 2012, 04:47:33 PM
Cheers Pier I'd like to place an order for one
APP STUDIO ING. PSU2 please.

also could you tell me what is the input voltage range for both 16 and 24 volt out, so i can devise a transformer to work for me at 230 volts in.

PM'd you too
Title: Re: APP Studio Ing's products - APP2050 AND APP2050E READY TO SEND OUT
Post by: ppa on November 01, 2012, 05:25:50 PM
Cheers Pier I'd like to place an order for one
APP STUDIO ING. PSU2 please.

also could you tell me what is the input voltage range for both 16 and 24 volt out, so i can devise a transformer to work for me at 230 volts in.

PM'd you too

Hi

with 230 V of AC power on input the power trasformers should be the following ones:

for +-16V out are indicated power trasformers with 15+15 VAC of secondaries and 230VAC or 220VAC of primary
(or 110+110VAC or 115+115VAC of primaries).
Moreover, are indicated for +-16V power trasformers with 18+18 VAC of secondaries and 240VAC of primary
(or 120+120VAC of primaries). These primaries must be connected in series.


for +-24V out are indicated power trasformers with 22+22 VAC of secondaries and 230VAC or 220VAC of primary
(or 110+110VAC or 115+115VAC of primaries).
Moreover, are indicated for +-24V power trasformers with 24+24 VAC or 25+25VAC of secondaries and 240VAC of primary (or 120+120VAC of primaries). These primaries must be connected in series.

In any case before to take the AC power trasformer send me an email for my suggestions, please.

thanks
cheers
Pier Paolo



for +-16V out are indicated power trasformers with 15+15 VAC or 18 + 18VAC of secondaries.
For +-24V out  I council 22+22VAC, 24+24VC , 25+25VAC of secondaries.
If you need an AC power trasformer for 230 VAC it should have a primary for 230VAC 

 


 
Title: Re: APP Studio Ing's products - APP2055, APP2050, APP2050E READY TO SEND OUT
Post by: oceres on November 02, 2012, 04:42:21 AM
Hello,

Any timeline for the APP2050 Germanium ones? Would be interested in a pair. Nice sTuff!
Title: Re: APP Studio Ing's products - APP2055, APP2050, APP2050E READY TO SEND OUT
Post by: ppa on November 03, 2012, 11:21:54 AM
Hello,

Any timeline for the APP2050 Germanium ones? Would be interested in a pair. Nice sTuff!


I have just a little stock ready to send out but before I put it on sale it is near to be ended.
I have a pair for you.
I am going to send you a PM.

thanks for inquiry
cheers
Pier Paolo
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: Nobru on November 04, 2012, 09:15:11 AM
I just love those op amps they sound goooooooooooooooood !
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: ppa on November 05, 2012, 03:04:30 AM
thank you very much for your comments

cheers
Pier Paolo
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: dogma on November 14, 2012, 05:33:11 PM
While I have not yet paid for my two ma1"s and two app992"s and two germ 2520 I just want to report pier is a pleasure to deal with and he is a real design talent - like so so many others here. It's my birthday and I'm merry!! Can't wait for th ma1s in my rack!!
Matt
[email protected]
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: dogma on December 01, 2012, 05:53:16 AM
Ive a pair on the way and give a thorough rundown after breaking them in. I;m thinking this is of the TG< EMI family with the germ and silicon transistors? Just a guess - in fact I;ve been thinking about the topology. Pier?
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: ppa on December 01, 2012, 04:32:09 PM
Ive a pair on the way and give a thorough rundown after breaking them in. I;m thinking this is of the TG< EMI family with the germ and silicon transistors? Just a guess - in fact I;ve been thinking about the topology. Pier?

No, MA1 is a my own design,
regading sound, the silicon version of MA1 (no germanium trasistors inside) sounds similar to TG EMI preamp I think.
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: electrisizer on December 03, 2012, 12:33:31 PM
hey ppa,

i need 2x 992 kits, when do you think are they ready again?

greets  :D
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: ppa on December 03, 2012, 12:44:02 PM
hey ppa,

i need 2x 992 kits, when do you think are they ready again?

greets  :D

I would have them ready to sell but I have not any 1N4148 diodes (8 for each 992) at the moment,
another forum menber has bought them without these diodes at the reduced price of 16.9 euro each one.
If you want buy them in this moment I can sell them to you without diodes.

thanks for inquiry
kind regards
Pier Paolo




Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: dogma on December 03, 2012, 02:16:15 PM
Hey Pier - Could you please check your email. From thenewmandmshow.at.gmail.dot.com - Cheers, MAtt
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: electrisizer on December 17, 2012, 03:34:41 AM
Quote

I would have them ready to sell but I have not any 1N4148 diodes (8 for each 992) at the moment,
another forum menber has bought them without these diodes at the reduced price of 16.9 euro each one.
If you want buy them in this moment I can sell them to you without diodes.

thanks for inquiry
kind regards
Pier Paolo

hey im interested and have send you a PM + mail... have you got them?
regards nico
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: ppa on December 17, 2012, 03:31:21 PM
pm sent

Pier Paolo
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: JimiB on December 19, 2012, 09:49:57 AM
sent you a msg
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: electrisizer on December 21, 2012, 01:14:07 PM
pm sent

Pier Paolo

hey ppa
ive answered the PM. perhaps messaging dosent work?

i want to buy two 992s OPAs - without diodes 16.9 each. so please send me your bank information with shipping costs
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: sr1200 on December 28, 2012, 12:59:55 PM
Sent email about 2 germ pres. (emailed the one listed on pg 1)
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: dogma on January 06, 2013, 10:37:46 PM
Hey Pier - I've sent a couple of emails - need to discuss order urgently before hospital admission - cheers, Matt
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: sr1200 on January 08, 2013, 04:00:32 PM
Any word on the shipping for my new toys? (anxiously awaiting!!)
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: ppa on January 08, 2013, 06:15:21 PM
If I did not get flu I will send you the parcel this week   :) , there were holiday days here in Italy ;)
(However the two pres are assembled at 80%)

Pier Paolo
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: sr1200 on January 09, 2013, 09:37:09 AM
Its going around over there too huh?  US has been plagued with flu this year!  Feel better!  Thank you.
Title: Re: APP Studio Ing's products
Post by: dubwarrior on January 19, 2013, 11:38:44 AM

regarding the phono pre I am working on PCB design yet.

regarding trasformers fro I/O boaed there is the following suggested:

-    CMOB-2H
-    CMOB-2L
–   CINEMAG CMOQ-2S
–   CINEMAG CMOQ-2L
–   CINEMAG CMOQ-2H
–   CLASSIC API EA2503
http://classicapi.com/catalog/product_info.php?cPath=21_37&products_id=79
–   JENSEN TRASFORMERS  JT-11SS-DLCF
–   JENSEN TRASFORMERS JT-123-ALCF

for clear sound I suggest you the CINEMAG CMOQ-2H, CMOB-2H,  JENSEN TRASFORMERS JT-123-ALCF, JENSEN TRASFORMERS  JT-11SS-DLCF.


kind regards
Pier Paolo

Hey Pier

Any news regarding the phono pre?

regards

Rico
Title: Re: APP Studio Ing's products
Post by: ppa on January 19, 2013, 11:52:25 AM
Hey Pier

Any news regarding the phono pre?

regards

Rico


I am working on it.
I have had a delay waiting the 2sk170 fets 
thanks for patience
Pier Paolo

 
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: berkleystudios on January 19, 2013, 12:53:57 PM
so this MA1 is 70 euros for everything but the transformers correct?
Title: Re: APP Studio Ing's products - MA1 GERMANIUM MIC DI PRE READY TO SEND OUT
Post by: ppa on January 19, 2013, 01:05:16 PM
so this MA1 is 70 euros for everything but the transformers correct?

are excluded in the MA1 kit

- transformers
- potentiometer for the gain
- knob for the pot
- jack socket for DI
- swicthes

all these things can be bought at classicapi.com of Jeff Steiger.

If you want, MA1 can use other different transformers than classicapi, but I have had very good performances using them.

the other components are inside the kit.

it is possible to pay with USD (since I buy some things from USA)

thanks for inquiry
kind regards
Pier Paolo





 


Title: Re: APP Studio Ing's products
Post by: dubwarrior on January 21, 2013, 06:51:50 AM
Hey Pier

Any news regarding the phono pre?

regards

Rico


I am working on it.
I have had a delay waiting the 2sk170 fets 
thanks for patience
Pier Paolo

Dont worry.

I just want to show that im still interessed in that project.

Regards
Title: Re: APP Studio Ing's products - APP2050E at 22 EURO!! FOR LIMITED NUMBER OF PIECES
Post by: ppa on January 26, 2013, 06:30:58 PM
Only for the first 25 pcs its is possible to buy APP2050E at only 22 EURO per pcs (S&H and paypal fees excluded). It is a very big deal !! Just at 34 euro per pcs the APP2050E is a deal, at this price APP2050E is pratically a gift.
This is to promote the new version!!

(this price is valid for 2 pcs or more).

thanks for reading.

Pier Paolo

Title: Re: APP Studio Ing's products - APP2050E at 22 EURO!! FOR LIMITED NUMBER OF PIECES
Post by: Walrus on January 28, 2013, 05:59:14 AM
Hi Pier, Are you still making the PSU2 as the start of this thread says Not Available. If they are available, I would like 5 please.
Title: Re: APP Studio Ing's products - APP2050E at 22 EURO!! FOR LIMITED NUMBER OF PIECES
Post by: ppa on February 18, 2013, 10:32:49 AM
Hi All,

I have decided to put on sale one MA1 pre.
MA1 is an hybrid germanium/silicon transistors mic preamp, very good sounding.
I sell MA1 in kit this thread on w. market but this unit is new and fully assembled.   

two photos of the unit I am selling here

(http://home.teletu.it/APPSI/MA1_AF127_15.JPG)


(http://home.teletu.it/APPSI/MA1_AF127_2.JPG)


I sell it at only 380 USD plus S&H and paypal fees,

please note: this sale is only for the group diy members.


kind regards
Pier Paolo

Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: pacemaker on April 09, 2013, 06:31:42 AM
email sent about 4 APP2050E
regards,
Francois
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: dubwarrior on April 19, 2013, 06:30:10 AM
Hy

Do you have any news regarding your Phono Pre?


Regards


Rico
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: ppa on April 19, 2013, 08:25:43 AM
Hy

Do you have any news regarding your Phono Pre?


Regards


Rico

Hi Rico,
I have got the PCBs, PSU included.

Pier Paolo
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: Indecline on April 21, 2013, 01:26:55 PM
Any news on when the MA1 kits will be back in stock? I've been itching to grab a pair ;)
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: ppa on April 21, 2013, 07:29:54 PM
Any news on when the MA1 kits will be back in stock? I've been itching to grab a pair ;)

pm sent
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: pacemaker on May 06, 2013, 04:46:42 PM
Hi Pier !
payment sent last mont , april 11th, for 4 APP2050E in 24v,
best regards,
Francois
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: ppa on May 07, 2013, 03:37:58 PM
Hi Pier !
payment sent last mont , april 11th, for 4 APP2050E in 24v,
best regards,
Francois

Hi Francois,

scuse me but the matter that I have not received any comunication that you have done the payment (no one from you and no one from paypal). I honestly thought that for some reason you would not have to buy them more or in the next future.


Pier Paolo

Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: Axelerator on May 15, 2013, 12:15:43 PM
Hi Pier,could you please send me the docs for the DIP version of your babys ?

anyway..just ordered two more vp28´s from jeff to fill them with the normal 992´s  ;D 8)
i did a extensive shootout recording the same synth and drummachine-loops and then looped always 2 combinations of opamps in the DAW . I had two vp28 each stuffed with the same opamp type to accumulate sound impact, AD was prism orpheus.
I testet gar2520´s, the diy melcors, your app2520 and their fet-broo´s, red dots , the now out of production germ opamps and for sure , the 992´s
I have to admit that the differences were sometimes to small to hear even hearing it in a continous loop.
(while just switching around before i could swear i had heared much more differences...)
but for me i clearly had two winners for this task :
the gar2520 gives the most ´compact´sound , some nice familiar glue with a trade off in detail which should be perfect for the drumbuss, i think that is the sound jeff had in his ear on his journey
with capi ;)
and on the other side the vp´s loaded with your 992´s...
very huge sound , the transformers start to shine out in the best way, lots of clear bass, 3D mids and pristine highs, nice transient detail. my fav. for synth recording !
so i had to order two more vp´s because i need two stereo channels, one based on gar2520, one on 992 .
just wanted to chime in with this !
axel
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: kante1603 on May 15, 2013, 12:27:11 PM
That's some great info Axel,thanks for sharing!

Hau' rein!

Udo ;)
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: Dr Gris on May 15, 2013, 03:27:30 PM
very huge sound , the transformers start to shine out in the best way, lots of clear bass, 3D mids and pristine highs, nice transient detail.

I' ll say it again, I have these in my four Analog Allstars EQP1S5 and they make them sound so refined!

Best
Magnus
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: Axelerator on May 15, 2013, 05:13:34 PM
 in the analog allstars i like the red dots most which were to harsh for my taste in the vp28 and the Lc53 where  i tried them also.
but i also have one analog allstar  equipped with the 992  ;D
greets
axel
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: kante1603 on May 16, 2013, 01:42:29 AM
Hi Axel,

one question on your vp28 tests,did you use the app992 in both doa positions?

Just curious,

Tschüss,

Udo ;)
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: Axelerator on May 16, 2013, 04:45:44 AM
moin Udo,
yes, all tests were done with two of the same doas in each vp28

grüsse !

axel
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: kante1603 on May 16, 2013, 06:40:51 AM
Cool,thanks Axel!

Udo.
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: ppa on May 19, 2013, 08:01:00 PM
and on the other side the vp´s loaded with your 992´s...
very huge sound , the transformers start to shine out in the best way, lots of clear bass, 3D mids and pristine highs, nice transient detail. my fav. for synth recording !
so i had to order two more vp´s because i need two stereo channels, one based on gar2520, one on 992 .
just wanted to chime in with this !
axel

thank you very much for comments
APP992 is a new and modern opamp so it needs comments.


 
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: ppa on May 19, 2013, 08:35:30 PM
very huge sound , the transformers start to shine out in the best way, lots of clear bass, 3D mids and pristine highs, nice transient detail.

I' ll say it again, I have these in my four Analog Allstars EQP1S5 and they make them sound so refined!

Best
Magnus


thank you very much for comments
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: Winetree on May 19, 2013, 11:41:45 PM
Axelerator,
I assume you ran the 992's at 16 volts because of the 16 volt 2520's and also to be a fair comparison.
Have you tried the 992's at 24 volts?
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: Axelerator on May 23, 2013, 08:09:08 AM
until now i just tested them at 16 volts.
still waiting for more 511x projects with 24 volt supply to give them more juice..
but, at 16 volts the 992 is already very good sounding and seems to be quite fast.
greets
axel
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: ppa on May 23, 2013, 08:53:02 AM
several gdiy menbers here use APP992 at 24V and they said me that it is a very good sounding DOA (there are some reviews on GDIY forum), but would be nice a comparison between 16V and 24V working.

BTW Axel tested APP992 with a trasformer balanced gears, with trasformerless gears APP992 runs more trasparent (and with the 3d sound) because trasformers add his color to the sound.
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: ppa on June 01, 2013, 04:54:06 PM
for contact me just send me an email to pier.paolo.abbate - at - gmail.com

Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: dogma on June 07, 2013, 02:12:29 AM
Hey Pier - As youve stopped offering the M1's, I think the Germ 992 would be attract a lot of people. Could you please consider doing more and keeping them on as a full time product?
Title: Re: APP Studio Ing's products - NEW! APP992DIP8, the APP992 for DIP8
Post by: ppa on June 07, 2013, 02:56:24 AM
Hi,

Regarding MA1, I have only temporarily suspended it to replace stock (I am waiting some components). Now I have replaced all kit's components except for the chassis, but I am just waiting them.

Title: Re: APP Studio Ing's products - MA1 germanium mic/di preamp
Post by: Marc Duchesne on July 14, 2013, 06:58:18 PM
Sent email for 2 MA1 kits today.
-marc
Title: Re: APP Studio Ing's products - closed
Post by: leadbreath on July 19, 2013, 05:43:35 PM
pier i would also be interested in the germanium doa's if u would reconsider restocking them?

mick
Title: Re: APP Studio Ing's products - closed
Post by: ppa on July 19, 2013, 05:54:32 PM
pier i would also be interested in the germanium doa's if u would reconsider restocking them?

mick

I have developed a new germanium doa , the APP2056,

APP2050GE is out of production

Pier Paolo

Title: Re: APP Studio Ing's products
Post by: dogma on August 03, 2013, 08:14:02 AM
Hi Pier - I purchased a Sontec 250 off another forum member. What opamps would you suggest to replace them with? I think your familiar with the circuit but I can get the ones currently in there. Great to see the Ma1 back in stock!. What is the new APP-MO6? And finally, how much are the germ opamps. Thanks pier. I'l l get this keyboard replaced one of these days - matt
Title: Re: APP Studio Ing's products
Post by: ppa on August 03, 2013, 11:05:05 AM
Hi Matt,

I think to APP992 , moreover I have changed some transistors to get a max power supply voltages
of +/-28V that is that used in Sontec eqs. APP992 is used in several DIY Sontec eqs with outstanding result.   
APP MO-6 is a replacement of the Neumann MO-6 but its socket is not the 2520/990.
In any case the   APP992 is much more trasparent than APP MO-6. 
APP2056GE is a germanium colored DOA, it cannot work with +/-28V of power supply.

Pier Paolo

Title: Re: APP Studio Ing's products
Post by: culteousness1 on August 06, 2013, 01:39:06 PM
Ciao Pier,

finally I found the time to finish my Dual Piccolo:

(http://culteousness.square7.ch/DIY/PICS/piccolo_front.jpg)
(http://culteousness.square7.ch/DIY/PICS/piccolo_inner.jpg)

So far I am very happy with this one.
No noise, hum or other weird things.

Was nice and easy to build!

Thank you,
Carsten
Title: Re: APP Studio Ing's products
Post by: sr1200 on August 06, 2013, 02:26:00 PM
Any way to add trim pots to that?
Title: Re: APP Studio Ing's products
Post by: ppa on August 06, 2013, 04:20:55 PM
Ciao Pier,

finally I found the time to finish my Dual Piccolo:
So far I am very happy with this one.
No noise, hum or other weird things.

Was nice and easy to build!

Thank you,
Carsten

many thanks for the post.
the work looks very good!

Pier Paolo
Title: Re: APP Studio Ing's products
Post by: ppa on August 06, 2013, 04:21:50 PM
Any way to add trim pots to that?

Yes, just using two 10k or 5k log pot and some coax wires
Title: Re: APP Studio Ing's products
Post by: sr1200 on August 06, 2013, 05:21:02 PM
 ;)  VERY interested.  My current PowerAmp needs to GO! ASAP lol.
Title: Re: APP Studio Ing's products
Post by: ppa on August 07, 2013, 04:57:09 PM
;)  VERY interested.  My current PowerAmp needs to GO! ASAP lol.

If you need more power and dynamic and better sound quality than "Piccolo" amp I have designed a mosfet power amp module rated of 100W 8ohm / 180 W/4ohm rms. To get a stereo power amp there are needed two boards. They have a powerful and precise sound with a lot of dynamic.
I have the PCB's available.
Title: Re: APP Studio Ing's products
Post by: culteousness1 on August 08, 2013, 06:28:50 AM
If you need more power and dynamic and better sound quality I have designed a mosfet power amps rated of 100W 8ohm / 180 W/4ohm rms.
The have a powerful and precise sound with a lot of dynamic.
I have the PCB available.

Pier, where can I find a schematic for this "Mille e Ventidue"?
I might be interested as well...

Cheers,
Carsten
Title: Re: APP Studio Ing's products
Post by: ppa on August 08, 2013, 08:14:51 AM
that "Mille e ventidue" amp is the previus version of this power amp module of 100W/ 8 ohm.

I am going to send you the 1022 docs by email.

"Mille e Ventidue" is 1022 in italian language.   

cheers
Pier Paolo
Title: Re: APP Studio Ing's products
Post by: culteousness1 on August 08, 2013, 08:53:04 AM
Ok. I thougt the 1022 was the actual one (100W/8Ω).
Could you send me the documents of the new version, please?

Carsten
Title: Re: APP Studio Ing's products
Post by: sr1200 on September 03, 2013, 04:52:59 PM
Quick question regarding the germanium DOA.  Have you heard of the DOAs going into thermal shutdown after a long period of use?  Had a LONG session the other day and one of my channels fizzled out after about 6hrs.  I turned off the unit, after a few, turned it back on and it was fine. 
Title: Re: APP Studio Ing's products
Post by: ppa on September 03, 2013, 05:39:44 PM
Quick question regarding the germanium DOA.  Have you heard of the DOAs going into thermal shutdown after a long period of use?  Had a LONG session the other day and one of my channels fizzled out after about 6hrs.  I turned off the unit, after a few, turned it back on and it was fine.

there is thermal shutdown only if the DOA have a wrong component inside or there is a short cut or a false contact inside it. I suppose that in your DOA there is a false contact that became open after some hours of work.

Pier Paolo
Title: Re: APP Studio Ing's products
Post by: sr1200 on September 04, 2013, 01:05:17 AM
How about if wires inadvertantly wound up ontop of the DOA smothering it.  Dunno how they got moved, they were ziptied together away from the chips.  Moved the wires out of the way, shes been cooking for about 4 hours now and no problems :)
Title: Re: APP Studio Ing's products - CLOSED
Post by: ppa on October 14, 2013, 05:26:40 PM
new stock of MA1
Title: Re: APP Studio Ing's products - CLOSED
Post by: kvothe on October 14, 2013, 07:14:57 PM
Now that´s timing! I can´t stop myself from midnight shopping   ;)
Title: Re: APP Studio Ing's products - CLOSED
Post by: ppa on October 14, 2013, 07:35:46 PM
Now that´s timing! I can´t stop myself from midnight shopping   ;)

payment request sent
Title: Re: APP Studio Ing's products - closed
Post by: fonzobrown on November 18, 2013, 05:36:46 PM
Ciao !...at the end here some APP1060's picture ( MA1's rack version) that  i've built

(http://24.media.tumblr.com/16ef2592e4f5c7e60b7267bca02f92a1/tumblr_mwhcleLYMi1rjxrq5o1_1280.jpg)

i've made with AF127 germanium Transistor, Classic api 2503 out transfo and silentarts's Haufe St8456 input transfo

(http://24.media.tumblr.com/59df235e9946a8c9fc3506a67c456ba8/tumblr_mwhcleLYMi1rjxrq5o2_1280.jpg)

PierPaolo helped me a lot to fix some component...and at the first listening they seems absolutely fanstastic especially on both elect. bass and guitar and of course voice too

(http://25.media.tumblr.com/f6257547e587d2fc1b1239f880cac223/tumblr_mwhcleLYMi1rjxrq5o3_1280.jpg)

So happy customer here, really thanks PierPaolo!  :)

 
Title: Re: APP Studio Ing's products - closed
Post by: Davidmccomb on November 25, 2013, 11:03:25 AM
Pier,

I would love to order one of your MA1 medium kits now that they are back in stock.



Dkm



Title: Re: APP Studio Ing's products
Post by: creal on April 04, 2014, 11:22:04 AM
Hi Pier,
I have a strange issue with the 48V rail of the PSU board.
I can't have more than 30.5v after the regulator.
I use a 2X22v Ac as transformer the jumper is in place.
I have a doubt about the C19/20 values because i found two different values in the shematics. I made my board with the 2010 schematic but some values are changed on the 2012.
I use 100uf/63 like is indicated in the first versoin of your schematic, IC3 is a LM317T.
The other rails work perfectly...

Cyril
Title: Re: APP Studio Ing's products
Post by: ppa on April 04, 2014, 03:14:09 PM
Hi Pier,
I have a strange issue with the 48V rail of the PSU board.
I can't have more than 30.5v after the regulator.
I use a 2X22v Ac as transformer the jumper is in place.
I have a doubt about the C19/20 values because i found two different values in the shematics. I made my board with the 2010 schematic but some values are changed on the 2012.
I use 100uf/63 like is indicated in the first versoin of your schematic, IC3 is a LM317T.
The other rails work perfectly...

Cyril



Hi Cyril,

could you tell me the voltage before the LM317?
100uf/63 caps are very good, many PSU2 works with them in 4 channels preamps.
I have change their values for 8 channels preamps.

thanks
Pier Paolo
 

Title: Re: APP Studio Ing's products
Post by: creal on April 05, 2014, 08:29:53 AM
Hi Cyril,

could you tell me the voltage before the LM317?
100uf/63 caps are very good, many PSU2 works with them in 4 channels preamps.
I have change their values for 8 channels preamps.

thanks
Pier Paolo
 

Hi Pier
The voltage at input of the 317 is 76.5.
Title: Re: APP Studio Ing's products
Post by: ppa on April 05, 2014, 08:40:21 AM
Hi Pier
The voltage at input of the 317 is 76.5.

Hi Cyril,

please check if R6 and R5 are inverted between them


Pier Paolo
Title: Re: APP Studio Ing's products
Post by: ppa on April 05, 2014, 08:43:35 AM
check please if D5 is inverted too, also put a 15k/22k resistor on +48V out. 
Title: Re: APP Studio Ing's products
Post by: creal on April 06, 2014, 08:21:54 AM
check please if D5 is inverted too, also put a 15k/22k resistor on +48V out.

Hi Pier
I got it, i've put a 1k trim instead the 10k.
i definitely need a good pair of glasses.

Thank you for your help

Cyril
Title: Re: APP Studio Ing's products
Post by: ppa on April 06, 2014, 05:27:19 PM
check please if D5 is inverted too, also put a 15k/22k resistor on +48V out.

Hi Pier
I got it, i've put a 1k trim instead the 10k.
i definitely need a good pair of glasses.

Thank you for your help

Cyril

It was a pleasure for me Cyril

The matter is that trimmers have too little labels :)

Pier Paolo

 
Title: Re: APP Studio Ing's products
Post by: ParkOne on July 06, 2014, 04:41:32 AM
Hi PPA :)
just send you an email to confirm an order.
Many Thanks,
a+
Title: Re: APP Studio Ing's products
Post by: alexc on August 21, 2014, 10:11:04 PM
Hi

Could someone please point me to the docs (schematic, bom ?) for the PSU2 pcb.

I have some APP Studio pcbs to build!

Thanks
Title: Re: APP Studio Ing's products
Post by: ppa on August 22, 2014, 12:33:33 AM
Hi

pm sent :)

Pier Paolo
Title: Re: APP Studio Ing's products
Post by: ppa on August 22, 2014, 12:39:54 AM
Hi PPA :)
just send you an email to confirm an order.
Many Thanks,
a+

I have not replayed this post here but transaction is done several days ago (items sold and sent)

 ;)
Title: Re: APP Studio Ing's products
Post by: ppa on August 22, 2014, 12:44:09 AM
Hi

Could someone please point me to the docs (schematic, bom ?) for the PSU2 pcb.

I have some APP Studio pcbs to build!

Thanks

OPS... my PM box was full   ;D
Title: Re: APP Studio Ing's products
Post by: ppa on August 22, 2014, 07:11:10 AM
Hi

Could someone please point me to the docs (schematic, bom ?) for the PSU2 pcb.

I have some APP Studio pcbs to build!

Thanks

docs sent by email  8)
Title: Re: APP Studio Ing's products
Post by: alexc on August 22, 2014, 07:23:18 AM
Thank you muchly PP

What a nice board set, I must say  (IO pcbs and PSU2 pcb).

These guys will become a nice set of poorman passive eq with makeup.

The hiZ is an elegent bonus.

fabulous.

AC
Title: Re: APP Studio Ing's products
Post by: ppa on August 22, 2014, 02:02:15 PM
Thank you muchly PP

What a nice board set, I must say  (IO pcbs and PSU2 pcb).

These guys will become a nice set of poorman passive eq with makeup.

The hiZ is an elegent bonus.

fabulous.

AC

thanks for comments
PP
Title: Re: APP Studio Ing's products - closed
Post by: ppa on August 22, 2014, 05:20:45 PM
Ciao !...at the end here some APP1060's picture ( MA1's rack version) that  i've built

(http://24.media.tumblr.com/16ef2592e4f5c7e60b7267bca02f92a1/tumblr_mwhcleLYMi1rjxrq5o1_1280.jpg)

i've made with AF127 germanium Transistor, Classic api 2503 out transfo and silentarts's Haufe St8456 input transfo

(http://24.media.tumblr.com/59df235e9946a8c9fc3506a67c456ba8/tumblr_mwhcleLYMi1rjxrq5o2_1280.jpg)

PierPaolo helped me a lot to fix some component...and at the first listening they seems absolutely fanstastic especially on both elect. bass and guitar and of course voice too

(http://25.media.tumblr.com/f6257547e587d2fc1b1239f880cac223/tumblr_mwhcleLYMi1rjxrq5o3_1280.jpg)

So happy customer here, really thanks PierPaolo!  :)

the MA1's 1U rack version in the photos was modified for 70 dB of gain with success, very low noise.   
Title: Re: APP Studio Ing's products
Post by: tonedude on September 23, 2014, 08:01:25 AM
Hi Pier Paolo, I'm interested in buying four more APP992 kit DOA's if you have those in store. I also wonder how the DIP model looks like? Plan is to fit them in an Igor Sontec EQ that already have DIP sockets mounted.

Best, Mattias
Title: Re: APP Studio Ing's products
Post by: ppa on September 23, 2014, 09:31:20 AM
Hi Mattias,

I have just sent the email with the total

regarding the dip version i have just some available

thanks
regs
Pier Paolo 
Title: Re: APP Studio Ing's products
Post by: tonedude on September 23, 2014, 09:51:01 AM
:)

Thanx!
Title: Re: APP Studio Ing's products
Post by: dingo on November 06, 2014, 05:24:33 PM
hello!
this is a new gyrators equalizer, it has been designed by PPA(Pierpaolo) for500rack
He has sent me 4 prototype pcb 's and  I have assembled them with his schematic.

It uses old and modern inedit discrete  topology using doa's
the gyrators use germanium transistor
it sound great! i like it so much.

This eq has a vintage sound -mids, basses are very good but high are fantastic
it has the particularity to not change the features of the sound at max boost/cut as an eq should do.
Moreover, with max gain you don 't keep noise or garbage,very quiet gear

I don't know if Pier Paolo has intention to put it inthe diy market, you shoud ask him!! ;)
dingo.

(http://i108.photobucket.com/albums/n39/ingosch/Mobile%20Uploads/IMG_20141103_173119-3.jpg) (http://s108.photobucket.com/user/ingosch/media/Mobile%20Uploads/IMG_20141103_173119-3.jpg.html)

(http://i108.photobucket.com/albums/n39/ingosch/Mobile%20Uploads/IMG_20141103_173059-1.jpg) (http://s108.photobucket.com/user/ingosch/media/Mobile%20Uploads/IMG_20141103_173059-1.jpg.html)

(http://i108.photobucket.com/albums/n39/ingosch/Mobile%20Uploads/IMG_20141103_172942-1.jpg) (http://s108.photobucket.com/user/ingosch/media/Mobile%20Uploads/IMG_20141103_172942-1.jpg.html)

here with his big brother..
(http://i108.photobucket.com/albums/n39/ingosch/Mobile%20Uploads/IMG_20141103_171801-1.jpg) (http://s108.photobucket.com/user/ingosch/media/Mobile%20Uploads/IMG_20141103_171801-1.jpg.html)



Title: Re: APP Studio Ing's products - MA1 Germanium pre and APP992 fet DOA are available
Post by: dogma on January 02, 2015, 02:48:22 PM
looks stunning.    Pier is such an amazing designer the world should know about him.....
Title: Re: APP Studio Ing's products - MA1 Germanium pre and APP992 fet DOA are available
Post by: ppa on January 03, 2015, 05:32:42 PM
Thanks dingo and dogma !!
Title: Re: APP Studio Ing's products - MA1 Germanium pre and APP992 fet DOA are available
Post by: Krcwell on January 04, 2015, 10:23:02 AM
Hi Pier,

Do you plan to offer kits for this eq?

Thanks,

Keith
Title: Re: APP Studio Ing's products - MA1 Germanium pre and APP992 fet DOA are available
Post by: Potato Cakes on February 13, 2015, 07:39:43 AM
Can the LED meter be used with the MA1 preamp? I noticed there are connections for it on the board. I also  noticed that there are several taps for potential add ons to the preamp. Are there any plans to do so?

Thanks!

Paul
Title: Re: APP Studio Ing's products - MA1 Germanium pre and APP992 fet DOA are available
Post by: ppa on February 14, 2015, 11:17:53 AM
Can the LED meter be used with the MA1 preamp? I noticed there are connections for it on the board. I also  noticed that there are several taps for potential add ons to the preamp. Are there any plans to do so?

Thanks!

Paul

Yes, I am developing a meter with 8 LED's for MA1. 
Title: Re: APP Studio Ing's products - MA1 Germanium pre and APP992 fet DOA are available
Post by: Potato Cakes on February 14, 2015, 01:13:56 PM
Sorry for all the questions, but can you give me the dimensions of the APP992 DIP8 PCB? I am wanting to change out the ICs in some of my existing gear with this, but don't know if it will fit in some of the spaces. Do you also offer this as a dual opamp so I can use them instead of ICs like the NE5532?

Thanks!

Paul
Title: Re: APP Studio Ing's products - MA1 Germanium pre and APP992 fet DOA are available
Post by: ppa on February 15, 2015, 08:49:16 PM
Sorry for all the questions, but can you give me the dimensions of the APP992 DIP8 PCB? I am wanting to change out the ICs in some of my existing gear with this, but don't know if it will fit in some of the spaces. Do you also offer this as a dual opamp so I can use them instead of ICs like the NE5532?

Thanks!

Paul

I am going to send you an email with all dimensions and features

Title: Re: APP Studio Ing's products - MA1 Germanium pre - APP992 fet DOA
Post by: mastertaenia on May 18, 2015, 12:38:04 PM
A little feedback on app 2050 installed in a classic api 312.
The doa compared to the 2520 have more level of dynamics, more headroom, more bandpass and fastest transient.
Obviously it's a modern doa and it's less "compressed"  then the 2520 but still have the classic "mid forward".
For me it's incredible on acoustic instrument and in 24v "mode"  is quite usable for classic music.
Thanks Pier Paolo
Title: Re: APP Studio Ing's products - APP992 fet DOA
Post by: fonzobrown on May 29, 2015, 08:11:04 AM
Hi Pier, in the last time i've assembled some different DOA's models

But at the end i've choose Your superfast APP992 to implement an analog stage for a custom AD converter ( using PCM4222EVM) that i'm cooking
Title: Re: APP Studio Ing's products - APP992 fet DOA
Post by: fonzobrown on May 29, 2015, 08:16:14 AM
From the first preliminary test Your DOA 992 seems to catch transients really well

: )
Title: Re: APP Studio Ing's products - APP992 fet DOA
Post by: fonzobrown on May 30, 2015, 09:01:10 AM
Ops...and i have forgot to thanks You Pier cause i've ended my mic pre too using Your APP1040 pcb.

As You can see i've experiment a bit using a neutrik NTM4 input transformer paired with proper resistor value. The out transfo is a Cinemag ...and the doa is a neumann oa10

...and the results is outstanding ( at least for me)
Title: Re: APP Studio Ing's products - APP992 fet DOA
Post by: okgb on June 18, 2015, 07:17:35 PM

 Pier, is a High integrity kind of guy. I've been happy with the opamps & preamps I've ordered from him
so I'll be checking out the  APP992 fet DOA .........................
Title: Re: APP Studio Ing's products - APP992 fet DOA
Post by: Vac11 on September 24, 2015, 08:38:39 AM
Hi Pier,

thanks for APP992´s.

Hope, that my solder joints are OK... I'll see (hear) in a few weeks :-)

MV
Title: Re: APP Studio Ing's products - APP992 fet DOA
Post by: Vac11 on September 24, 2015, 08:39:25 AM
2
Title: Re: APP Studio Ing's products - APP992 fet DOA
Post by: Vac11 on September 24, 2015, 08:39:55 AM
3
Title: Re: APP Studio Ing's products - APP992 fet DOA
Post by: druu on September 27, 2015, 05:12:30 AM
Vac11, if i'm not mistaken, you have mounted the DOA's upside down. They should be mounted atypical of other DOA mountings (i.e. PCB traces facing upward).
Title: Re: APP Studio Ing's products - APP992 fet DOA
Post by: kante1603 on September 27, 2015, 05:44:57 AM
Vac11, if i'm not mistaken, you have mounted the DOA's upside down. They should be mounted atypical of other DOA mountings (i.e. PCB traces facing upward).
You´re right druu,all are upside down ::) 
Look here:


http://groupdiy.com/index.php?topic=49711.msg633968#msg633968


Best,


Udo.


Edit:Link attached
Title: Re: APP Studio Ing's products - APP992 fet DOA
Post by: ppa on September 27, 2015, 10:53:06 AM
Hi All,

the first version APP992 was  upside down, instead the actual version (from a few of years ago) is normal as Vac11 did.


Pier Paolo
 
Title: Re: APP Studio Ing's products - APP992 fet DOA
Post by: kante1603 on September 27, 2015, 11:40:48 AM
That will make Vac 11 a happy guy ;D
I hope the build hasn´t changed technically?

Best,


Udo.
Title: Re: APP Studio Ing's products - APP992 fet DOA
Post by: druu on September 27, 2015, 12:28:22 PM
Glad we cleared that up! Thanks Udo and Pier!
Title: Re: APP Studio Ing's products
Post by: tmuikku on October 27, 2015, 04:57:43 PM
hello!
this is a new gyrators equalizer, it has been designed by PPA(Pierpaolo) for500rack
He has sent me 4 prototype pcb 's and  I have assembled them with his schematic.

It uses old and modern inedit discrete  topology using doa's
the gyrators use germanium transistor
it sound great! i like it so much.

This eq has a vintage sound -mids, basses are very good but high are fantastic
it has the particularity to not change the features of the sound at max boost/cut as an eq should do.
Moreover, with max gain you don 't keep noise or garbage,very quiet gear

I don't know if Pier Paolo has intention to put it inthe diy market, you shoud ask him!! ;)
dingo.

here with his big brother..

hello!

interesting EQ, is there more info available? could Pier Paolo maybe elaborate?

Feature wise its something i've been looking for. Sound wise, can't be bad :)

thanks!
Title: Re: APP Studio Ing's products - APP14GE - new germanium DOA - 2520 format
Post by: ppa on November 04, 2015, 05:27:48 PM
Hi,
thanks for the interest on the eq,
It has 3 bands and 6 frequencies per band.
The first 5 of these  frequencies of each band are similar to those of the 550a.
This eq uses two DOA's and 3 germanium based gyrators.
Actually I have not intention to put it on the market, but I should have some prototype PCB's.
BTW if you want, you may send me an email so I could send you better details on it.
best regards
Pier Paolo
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: Rocinante on November 06, 2015, 12:49:33 AM
A little while ago I finished a dual channel helios 69 using Ian's filters and the io board for the make up. Its fantastic.  Incredibly versatile with being able to switch between various DOA's and IC's. Its a keeper. So thank you Pier. I think I might have to try your 1040s. I'll pm you.
Dylan
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: ppa on November 06, 2015, 11:40:05 AM
thanks very much for comments on I/o board,
I am going to read your pm.
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: mrcase on November 06, 2015, 12:51:05 PM
Your APP14GE  germanium DOA sounds promising. Is it a drop in for an api312 gar2520? What voltage would it like to see?

thanks,
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: ppa on November 06, 2015, 03:46:57 PM
Your APP14GE  germanium DOA sounds promising. Is it a drop in for an api312 gar2520? What voltage would it like to see?

thanks,

thanks very much for interest

Yes, APP14GE can be used inside a 312 preamp.
I have designed it for a power supply voltages from dual 14V to dual 25V.
I have sold a few of pcs before posting in GDIY and they run inside 312 clone preamps too.

Pier Paolo

 
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: buildafriend on November 07, 2015, 12:20:16 PM
Your APP14GE  germanium DOA sounds promising. Is it a drop in for an api312 gar2520? What voltage would it like to see?

thanks,

thanks very much for interest

Yes, APP14GE can be used inside a 312 preamp.
I have designed it for a power supply voltages from dual 14V to dual 25V.
I have sold a few of pcs before posting in GDIY and they run inside 312 clone preamps too.

Pier Paolo

Can I see a picture of one?
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: ppa on November 08, 2015, 04:01:34 PM
just a photo.

This is one of the prototypes
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: Potato Cakes on November 10, 2015, 05:07:45 PM
I have built a number of the APP14GE and though I have yet to do some critical listening to them, I did test them in a CAPI VP25 module and they worked perfectly.
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: ppa on November 21, 2015, 03:00:05 PM
a better photo of the app14ge
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: dribro on February 05, 2016, 05:50:21 PM
Hi Pier

Sent you an email. Down for a few doas!
Thanks!
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: dribro on February 06, 2016, 02:54:01 PM
Payment sent. Thanks for the invoice.
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: rob61 on February 06, 2016, 06:25:45 PM
How would you describe the difference sonically between the new APP14GE and your 992?
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: ppa on February 06, 2016, 07:57:03 PM
How would you describe the difference sonically between the new APP14GE and your 992?

 APP992 is very trasparent with a bit a fet background, very high dynamics, with "expensive elegant sound" as some diyers said me. I am using all words of who use it.
I have designed it for line stages for S/N and THD upgradings, for who want a trasparend but not ice sound.
It has both an ultra low voltage noise with a an ultra low current noise, much better than famous IC opamps.
Very high slew rate and bandwith and top high stability for eqs, unbalancing stages and IV converters for DACs.

APP14GE is an mixed vintage and modern design to have modern performances with vintage sound with germanium color.
Very warm sound. And thick.

APP14GE can run both a +-16V and -+24V of power supply.
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: Whoops on February 11, 2016, 10:23:26 PM
Hello Pier Paolo,
I would like to ask you why did you discontinued the 2050 op amp?

I loved those op amps and would like to buy more, was amazed when I saw you were not selling them anymore

thanks
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: ppa on February 13, 2016, 02:16:40 PM
thanks for your feedback  :)
I discontinued the APP2050 when I  started the APP992 sale as people bought  mostly the APP992 than the APP2050, probably, because they supposed maybe that the APP992 was better.
The matter is that these ones are simply different between them. Who had previously bought the APP2050, he bought as the APP2050 again, but was a strong internal competition the same.

How many pcs you would need?
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: Whoops on February 13, 2016, 10:04:16 PM
Hi Pier Paolo, I'm doing a 4 channel 321 type build, I had 2 never used 2050 opamps that I was keeping and wanted to buy 2 more.
Although something is wrong with my opamps.

Will send you and email
thanks
Title: Re: APP Studio Ing's products - NEW! APP14GE germanium DOA in 2520 format
Post by: dribro on February 24, 2016, 08:30:10 AM
Hi Pier

Got the kits. Looking good.

thanks!
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: Humner on April 24, 2016, 06:58:30 PM
hi,

i'm interested in the germanium DOA. I was thinking of using my own germanium transistors which I have stock of from past projects - is it best to test them before they go in? Will a "leaky" transistor be OK in the DOA or should I find "stable" germanium transistors for the DOA?

Thanks
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: ppa on April 26, 2016, 07:58:42 PM
App14ge can accept a few of different sockets so it's probably that your transistor can be used on it, but I should see if your transistor is  electrically compatible with the app14ge.
I suspect that with a simple mod it might be used on app14ge. So at this point I need the name of your transistor please
thanks for posting
best regards
Pier Paolo
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: Humner on April 26, 2016, 09:26:03 PM
AC128K

I bought many for a fuzz a few years ago so I have spares in my parts bin. I tested quite a few of them as they required to be "stable" for the fuzz circuit, but I'm wondering if the ones which tested "unstable" or leaky could be used in your DOA?

Do you sell just the PCB I want to try it as the summing amp in my mixer project and also as output driver for a 600:600 transformer.

Happy to even trial it myself. I would be interested in 4 PCB's

Rob
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: ppa on April 28, 2016, 07:17:28 PM
The ac128k is very slow so the opamp may have a stability problem. I should test it on app14ge, it might be a bit hard to mod for the best way. But,
I have a big entire stock of af106 ,  I sell it at very cheap price inside the kit. I think that I can't mod the app14ge for your transistor very soon.
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: Humner on April 28, 2016, 07:49:24 PM
The ac128k is very slow so the opamp may have a stability problem. I should test it on app14ge, it might be a bit hard to mod for the best way. But,
I have a big entire stock of af106 ,  I sell it at very cheap price inside the kit. I think that I can't mod the app14ge for your transistor very soon.

Thanks for checking it out for me. Much appreciated.

I will email you shortly for some kits, I still want to try the app14ge!

Cheers

Rob
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: Greebok on May 18, 2016, 04:46:08 PM
Hi Pier,

could you answer to my email please? Any updates about the total?  ::)

Cheers,
Serg.
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: ppa on May 19, 2016, 08:04:19 AM
Hi Serg.

I have  searching for it,  just the time to do it. I have sent an email with the replay for your need.  ;)
 
cheers
Pier Paolo
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: Rocinante on May 19, 2016, 10:50:10 AM
Hey I almost forgot to post these.   I built some of Pier's 540 eqs and I had wanted to take pics in a better environment but I can't take them out of the rack  cause I use them too much on too many sessions.  Gyrator to the max and absolutely phenomenal in there ease of use.  They are utilitarian yet have the oomph a punch that modern DOA with  2503 output xfmrs impart.  I haven't tried them on the mix buss yet but I am imagining they will be great.

Anyways here are some pics.

(http://s26.postimg.org/5v89q1bmh/20160317_124107.jpg) (http://postimage.org/)
 (http://postimage.org/)

(http://s26.postimg.org/s5w4q08wp/20160317_124022.jpg) (http://postimage.org/)
 (http://postimage.org/)

(http://s26.postimg.org/8rvaqbhg9/20160210_145623.jpg) (http://postimage.org/)
 (http://postimage.org/)

(http://s26.postimg.org/qtefo4bh5/20160315_145919.jpg) (http://postimage.org/)
 (http://postimage.org/)


Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: ppa on August 10, 2016, 05:44:58 PM
many thanks,
 
this is the production PCB's set. A little stock has just been arrived to my place.
Here a pic.


(http://groupdiy.com/gallery/0/38158-100816180336.png)
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: Lowfreq on August 11, 2016, 02:53:48 AM
Are these EQ's going to be available for us to buy? Kit form or pcb?
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: ppa on August 11, 2016, 04:32:36 AM
Are these EQ's going to be available for us to buy? Kit form or pcb?


Actually I sell the PCB's only, I have available 6 pcs only since the other ones of the same little stock have been all sold on presale.
At this point I exstend the presale for these 6 ones too, the price is 22 euro each for one pc and 20 euro for >1 pc , S&H and paypal fees are excluded.
Are available BOM, schematic and front panel draft.
Thanks

Greetings
Pier Paolo
 

 
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: okgb on October 11, 2016, 02:55:54 PM
Hey Pier  Do you have a website ? Do you sell other germanium xitors for the MA-1 ?
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: ppa on October 11, 2016, 05:56:52 PM
Hi Greg,

no, I haven't a website actually online.
The best transistor I have found for the MA1 is the AC126, I have only modified the values of a few of resistors  of MA1 schematic  because I don't want change it since I think that generally people like it as it is.
If I change it I should call it MA2 and not MA1 or with another name just to be clear. 

Pier Paolo   
     
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: ppa on October 11, 2016, 07:40:50 PM
BTW  AC126 is not hard to found since is very important that any component can be replaced, this is one of the points because I consider it the best germanium transistor for the MA1.
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: Humner on October 14, 2016, 05:05:43 PM
That EQ540 look great, are there any further details or a build thread?

I built up 4 x APP14GE with the AF106 germanium - great DOA Pier! the guide was clear walked me through with no problems during the build.

Heres a picture of them while I test them in place for VE summing and line driver duties for my custom console mixer. Sounds great.

(http://www.thraxeh.com/Pics/ppadoa.jpg)
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: ppa on October 15, 2016, 08:09:10 PM
Thank you very much for comments and the photo, I like it very much.

I am writing the assembly manual but actually it is only a draft of it, however I can give the same instructions I have sent to who has built it.

thanks
Pier Paolo

Title: Re: APP Studio Ing's products - APP14GE germanium DOA - MA1 germanium preamp
Post by: TillM on December 25, 2016, 11:31:37 AM
When will be the MA1 Preamp back in stock?
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: TillM on March 04, 2017, 05:38:14 PM
Hello Pier Paolo,
thank you so much for the APP14GE and your App992.
I built this DOAs in the last weeks.
Very good documentation and quality parts. The PCB from the APP14GE is top notch.
Already tested booth and I really like how they sound. The APP992 has a very classy sound to my ears especially in the highs.
The APP14GE has such nice harmonics. I tried them on my overheads. I just love it and highly recommend booth DOAs.
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: tonedude on April 15, 2017, 02:14:07 AM
Hi Pier Paolo, is it possible to use an ac126 in the app14ge?

Kindly, Mattias
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: ppa on April 15, 2017, 08:26:51 AM
Hi Pier Paolo, is it possible to use an ac126 in the app14ge?

Kindly, Mattias

Hi Mattias,

no, it cannot be used inside it.
thanks
Pier Paolo

Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: tonedude on April 15, 2017, 12:47:50 PM
Thx Pier Paolo!

I emailed you an order of four app14ge.

Kindly, Mattias
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: TillM on June 25, 2017, 12:37:55 PM
I made a short Demo with the APP14GE with AF127 transistor and the APP992.
No Processing.
Enjoy.

1. APP14GE
https://www.dropbox.com/s/uztd4kr5c0knzo5/APP14GE%20127AF.wav (https://www.dropbox.com/s/uztd4kr5c0knzo5/APP14GE%20127AF.wav)

2. APP992
https://www.dropbox.com/s/q28qnrv5g84i68r/APP992.wav (https://www.dropbox.com/s/q28qnrv5g84i68r/APP992.wav)
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: Potato Cakes on July 09, 2017, 09:52:55 PM
Pier,

I finally got the knobs on it and was able to start messing around with it. This thing sounds fantastic! I tested them with program material and it behaves like high end mastering EQ’s in regards to the high and mid bands. Boosting some 4k gives that more forward feel to the entire track without the harsh graininess that is associated with cheap equalizers. I know this is all subjective “gear-head” talk, but since I do mostly mixing, I just plug things in and see how they sound. After all, that is ultimately what matters in my world. I am using these with the recommended APP 992/14GE combination.

The knobs I got are a bit on the cheap side. I had to drill the cavity deeper to accommodate for the switches, so now they don’t sit perfectly in place, but they do the job.

I do need to replace the LEDs. The ones I had that were the correct size were white, and even with adding resistors they are still too bright. I just need to find a low output green or red and I should be good.

Anyway, very awesome EQ. Looking forward to what you have coming out next.

Thanks!

Paul
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: ppa on July 10, 2017, 04:47:31 PM
many thanks for your comments on my new eq APP540.
I have just available the PCB's , BOM, schematic and .dxf and fpd files.

Pier Paolo
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: ppa on July 15, 2017, 08:35:51 AM
another app540  review is here

http://realgearonline.com/thread/5796/app540-500-series-discrete-eq
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: jensenmann on July 22, 2017, 06:11:00 AM
Hi group
I just wanted to give some feedback to Pier about his APP992 in my Sontec 250 clone from donclassics.com.
My background is that I do maintenance work in quite some studios, a bunch of mastering studios included, in my area. The latter ones all equipped with one or two Sontec EQs. From my first experience with a real Sontec on I was hooked on these. I consider them to be amongst the very finest EQs ever, if not the best at all (whatever best means...). So when Igors 8 channel kit became available I built them using 2604 opamps throughout. The first comparison the the real 250 was disappointing. While Igor´s kit is a fine EQ it has a totally different tonality and the HF band, which he unfortunately modified, couldn´t hold a candle compared to the original. In itself it´s a nice and versatile EQ, better than many if not most others. But still far away from  the real deal.
Later on when the Donclassic came out I made one of these for myself. First I´ve been using OPA132 at the input/summing position for money and convenience reasons but it quickly turned out that it didn´t have the headroom a real Sontec has, as well as it didn´t sound like a real Sontec. The HF band sounds a lot closer to the original than Igor´s version, though. That gave me hope at least and I changed the OPA chips to APP992 DOAs running on +-24V. That solved the headroom problem and the tonality came a lot closer to the original 250 boxtone, closer than any other version before. It still isn´t exactly the same, but I haven´t heard anything better yet.

So there you have it, my opinion at least. Give the APP992 DOA a try in your Sontec builds.
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: Potato Cakes on July 22, 2017, 12:28:42 PM
I second this DOA for high end EQ applications. I am using APP992 in my DR MQ-5 and it sounds fantastic.

Thanks!

Paul
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: kante1603 on July 22, 2017, 12:40:55 PM
I have them on my Igor F76 on output,was a great improvement too.


Best,


Udo.
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: kogstudio on September 09, 2017, 09:10:07 PM
Has anyone tried the APP14GE opamps in their Sontec style builds?
I have the APP992's currently, but was interested for fun in what difference the  APP14GE  might give.
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: TillM on October 19, 2017, 04:20:56 PM
any news about the MA1 ?
Will they get back in stock?
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: yoons on October 27, 2017, 06:04:19 AM
any news about the MA1 ?
Will they get back in stock?

If it happen, I would be in for 2 kits ;)
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: ppa on October 28, 2017, 07:39:42 PM
Hi, I am developing the new chassis, I hope to finish it very soon.
Pier Paolo
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: TillM on October 29, 2017, 04:00:45 AM
Do you have to do it completely new? I hoped frank will fix it for you.

btw: I'm in for three
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: TwentyTrees on November 08, 2017, 03:09:53 AM
I'm also in for a pair of MA1s when you get them back in stock!
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: rackmonkey on February 15, 2018, 04:35:05 PM
Please put me down for 2 MA1s when back in stock as well.

Thanks,

Bryan
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: DjaiTeam on February 18, 2018, 05:01:04 PM
Hi, great work here.
I'm also in for one MA1 kit.
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: ppa on February 18, 2018, 08:47:26 PM
Hi All,

the new chassis has been fixed and it's ready to be used.
Actually I am not able to accept orders but I hope to be ready to handle them soon.
I have put you down for these kits. 
BTW is fine posting  orders here and PM or email me for my better organization.
thanks

Pier Paolo
     
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: frenkonio on February 26, 2018, 08:38:04 AM
Pier Paolo, sent you an email at end of January, still being waiting for a reply (and I'm italian so not so far!). Let me know. Thanks!
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: Mulmany on March 09, 2018, 09:14:54 PM
Are the APP992 dip8 versions still available?
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: ppa on March 10, 2018, 03:49:03 PM
Are the APP992 dip8 versions still available?

Actually it isn't available since I am waiting the new stock of PCB's,
I will keep you posted.
thanks
best regards
Pier Paolo
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: Mulmany on March 17, 2018, 10:09:31 PM
Actually it isn't available since I am waiting the new stock of PCB's,
I will keep you posted.
thanks
best regards
Pier Paolo

Great. Thanks.
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: kante1603 on June 17, 2018, 12:53:12 PM
Dear Pier Paolo,


looking at the first post here it says the shop was closed by June.
Do I get it right that you don‘t sell your fantastic products anymore?


Please tell us that I‘m wrong.......


Best regards,


Udo.
Title: Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
Post by: TillM on June 17, 2018, 02:47:32 PM
Dear Pier Paolo,


looking at the first post here it says the shop was closed by June.
Do I get it right that you don‘t sell your fantastic products anymore?


Please tell us that I‘m wrong.......


Best regards,


Udo.

F**k !!!
In May the massage was, that you help your parents. I really hope that all is going well, as I write you in my last e-mail.
As Udo said, please don't close your shop !
I really love every single product I buy at your shop !
If you close your shop, please tell us a opportunity that we can still buy your fantastic stuff.

get well soon Pier Paolo !
best regards,
Till.
Title: Re: APP Studio Ing's products - CLOSED
Post by: ppa on June 21, 2018, 02:54:42 PM
Hi Udo and Till,

many thanks for your posts, very appreciated.
I have reduced time for APP studio ing. but since some my products liked (and like) to several/many diyers  I am thinking to a solution to continue my service, maybe with external vendors.

Pier Paolo
Title: Re: APP Studio Ing's products - CLOSED
Post by: kante1603 on June 21, 2018, 08:56:32 PM
Hello Pier Paolo,


this is still sad news.
But things in life change,and I understand that.
If you could find a way to offer the remainiing stock (if there is any) it would help some of us of course.
I still love my APP 992s in various builts I have done over the years.
But when it´s over then it´s over.
You have always been a very kind person and a great contributor to this forum,you sir are a gentleman.


Good luck for you in the future,I hope everything goes well for you.
Thank you very much for everything you did for us diy-ers,


Best regards,


Udo.



Title: Re: APP Studio Ing's products - CLOSED
Post by: TillM on June 22, 2018, 04:20:11 AM
+1
Title: Re: APP Studio Ing's products - CLOSED
Post by: helterbelter on July 10, 2018, 06:02:09 PM
Hi Pier Paolo,

Sorry to hear about your personal situation, I hope all is going well. Or getting well soon.

In case you still have some of your APP14GE Doa kits, I'd like to purchase a pair of both versions. But I'm in no hurry. PM me whenever you like.

Wish you the best.

Greetings,

Paul
Title: Re: APP Studio Ing's products - CLOSED
Post by: Mike Havok on August 17, 2018, 07:25:19 AM
Hi Pier Paulo,

Sorry to hear the news, obviously family comes first before everything so I wish you all the best with everything.
If you do find a way to continue your DOAs I would love to get one of each of the APP15GE. I've been planning a build around them but was trying to get my current projects finished first.

Thanks
Mike
Title: Re: APP Studio Ing's products - CLOSED
Post by: ppa on August 20, 2018, 01:42:06 PM
Hi Pier Paulo,

Sorry to hear the news, obviously family comes first before everything so I wish you all the best with everything.
If you do find a way to continue your DOAs I would love to get one of each of the APP15GE. I've been planning a build around them but was trying to get my current projects finished first.

Thanks
Mike

Hi Mike,

PM sent

Pier Paolo
Title: Re: APP Studio Ing's products - CLOSED
Post by: Kevin on September 23, 2018, 07:02:40 PM
if someone is looking for MA1. I sell two channels on the black market
Title: Re: APP Studio Ing's products -
Post by: TillM on November 24, 2018, 05:15:49 AM
Hi Pier Paolo,
I’m glad that you are back !
I finished your APP540 EQ you send me at the beginning of this year.
Great sounding EQ.
Title: Re: APP Studio Ing's products -
Post by: TillM on November 24, 2018, 05:17:42 AM
And now from the top. Used your APP992 and APP14GE combination with a 2503 output transformer.

I’m so happy and can’t await my DOAs I ordered from you.
Title: Re: APP Studio Ing's products -
Post by: ppa on November 30, 2018, 01:21:08 PM
Hi Till,

many thanks
Pier Paolo
Title: Re: APP Studio Ing's products - MA1 germanium pre - APP540 gyrators 500 rack eq
Post by: rackmonkey on December 16, 2018, 01:13:49 AM
Hi Pier Paolo. Do I understand correctly that you are selling your products again? If so, i’m Interested in two MA1 kits.

Thanks,

BT
Title: Re: APP Studio Ing's products - MA1 germanium pre - APP540 gyrators 500 rack eq
Post by: ppa on December 16, 2018, 07:23:34 AM
Hi Pier Paolo. Do I understand correctly that you are selling your products again? If so, i’m Interested in two MA1 kits.

Thanks,

BT

Hi, yes, app studio ing. is open.
For the two MA1 I am going to send you a PM.
thanks
best
Pier Paolo
Title: Re: APP Studio Ing's products - MA1 germanium pre - APP540 gyrators 500 rack eq
Post by: Potato Cakes on December 16, 2018, 07:55:32 AM
Pier,

So very happy you are back. Looking forward to doing business with you again soon and to what you've got coming out soon.

Thanks!

Paul
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: ArnoldLayne on December 29, 2018, 04:48:24 PM
Hi Pier Paolo,
I finally picked up my two MA1 kits from the post office !
The PCB's look high quality, and they were nicely packed  :D

Thanks !
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: Winetree on December 29, 2018, 08:17:10 PM
Good to see you're back. Great products.
Any more info on the APP1040 mic/di preamp board?
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: ppa on January 01, 2019, 05:16:25 PM
Hi, 

I have designed the 500 rack version of this pre, I have not changed anything,
I have a prototype too.
It uses the same chassis of MA1.
BTW the 500 rack version sounds as the app1040.
In any case I should have available some app1040 PCB s.
Pier Paolo
 
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: ppa on January 01, 2019, 05:28:08 PM
Good to see you're back. Great products.
Any more info on the APP1040 mic/di preamp board?

thank you very much for comments

the app1040 doesn't use electrolytic capacitors  on the signal path and on the negative feedback net,
but a DC servo system to avoid them.
It's based on a DOA and transformers on in and out.
It can use several DOA's and transformers inside, my DOA's, GAR ones and many 2520 clones too. BTW a few of CAPI, AVDO, Cinemag,  transformers are included in the list.   
 



 
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: JulenJVM on January 13, 2019, 03:03:31 PM
Dear Pier Paolo,

Hope all is well!

Is the APP540 EQ kit still available? I'm interested in 2 kits.

Thank you!
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: SKJGProject on January 13, 2019, 07:43:19 PM
Me too

Dear Pier Paolo,

Hope all is well!

Is the APP540 EQ kit still available? I'm interested in 2 kits.

Thank you!
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: ppa on January 13, 2019, 08:25:57 PM
Hi

thanks for posting
I have the PCB's available plus the pin sockets actually.
Pier Paolo
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: JulenJVM on January 14, 2019, 02:02:16 PM
Hi

thanks for posting
I have the PCB's available plus the pin sockets actually.
Pier Paolo

Hello Pier Paolo,

Thanks for answering! I have only heard good things about your eq, so I wanted to check them out. I'm a newbie to DIY, so I'm afraid it might be too difficult to get them completed.
How hard is the build? And would it be difficult to get the full BOM and some building directions?

Thank you in advance
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: ppa on January 14, 2019, 05:18:53 PM
Hello Pier Paolo,

Thanks for answering! I have only heard good things about your eq, so I wanted to check them out. I'm a newbie to DIY, so I'm afraid it might be too difficult to get them completed.
How hard is the build? And would it be difficult to get the full BOM and some building directions?

Thank you in advance

Thanks for comments.

I do not recommend APP540 eq for newbies just for its  complexity even if it has not trimmers inside to set.
APP540 complexity is similar to that of an 550 eq clone to be clearer.

Pier Paolo
   
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: Potato Cakes on January 14, 2019, 07:45:45 PM
Thanks for comments.

I do not recommend APP540 eq for newbies just for its  complexity even if it has not trimmers inside to set.
APP540 complexity is similar to that of an 550 eq clone to be clearer.

Pier Paolo
 

I agree with Pier that this is definitely not for those starting out with DIY. I did a write up on this forum a while back for those who are just now starting out building their own gear (https://groupdiy.com/index.php?topic=68195.msg867001#msg867001) and without trying to be self promoting, I would encourage you to read through it before you start ordering boards. It's meant to help people like yourself to avoid making all the mistakes and waste all the money I did trying to learn building gear.

Thanks!

Paul
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: JulenJVM on January 15, 2019, 12:25:55 PM
I agree with Pier that this is definitely not for those starting out with DIY. I did a write up on this forum a while back for those who are just now starting out building their own gear (https://groupdiy.com/index.php?topic=68195.msg867001#msg867001) and without trying to be self promoting, I would encourage you to read through it before you start ordering boards. It's meant to help people like yourself to avoid making all the mistakes and waste all the money I did trying to learn building gear.

Thanks!

Paul

Thank you Paul for the advice, it's a very well thought out text and with very good intentions. I'm not your usual newbie though, I'm extra meticulous in everything I do, and take special care in new fields, like DIY gear for me. The first time I've picked up a soldering iron was last month, and I built a colour palette with 3 colour modules (vintage bundle). I started with the 15ips card, measuring resistors 3 times, and using the iron for the first time. This card was the sloppiest, but soldering the other modules was much better. I learnt to be aware of polarity (very well marked on all the pieces concerned), it's OK as long as it's clear where the + hole is. And then I built the palette, the most challenging piece, but the best is that it worked well from the very first time. I had to correct some cold solders (looked like bubbles), but it was easy, and it was an amazing experience that made my heart race. The best bit was when I plugged it in, the LEDs light up, all knobs worked, and all colour modules passed sound as expected. A great experience, not sure why I didn't do it before.

But maybe you're right, and I should go for other "easier" builds to get better, and come back when I have more experience. Hopefully Pier Paolo is still around in a few months time ;)

Off to research now 500 series eq kits now, thank you both very much for your time and advice.
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: Blackdawg on January 23, 2019, 12:11:58 AM
Are your op amps kits still available?

Thanks
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: ppa on January 23, 2019, 08:19:38 AM
Are your op amps kits still available?

Thanks

Hi,

yes, they are available
thanks for posting
Pier Paolo
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: Blackdawg on January 23, 2019, 12:08:31 PM
Hi,

yes, they are available
thanks for posting
Pier Paolo

Excellent! I've read some wonderful things about the APP992 in Sontec builds. Hoping to use some in mine.

I think I also read you made a DIP8 version? is this true? Could be cool to use in place of OPA2604s the DR MQ5 calls for perhaps.

What is the best way to order? PM or email?

Thanks!
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: ppa on February 09, 2019, 10:06:26 AM
Excellent! I've read some wonderful things about the APP992 in Sontec builds. Hoping to use some in mine.

I think I also read you made a DIP8 version? is this true? Could be cool to use in place of OPA2604s the DR MQ5 calls for perhaps.

What is the best way to order? PM or email?

Thanks!

just to update, the kits has been sent.
Pier Paolo
Title: Re: APP Studio Ing's products - OPEN - MA1 germanium pre - APP14GE germanium DOA
Post by: ppa on February 09, 2019, 10:07:22 AM
the kits has been sent with the new app992 version.
Pier Paolo
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: Leon on August 04, 2019, 10:54:55 PM
Sent you a PM for 4 x APP992 kits.

Thanks,
Leon
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: ppa on August 05, 2019, 05:05:37 AM
Hi Leon, thanks for buying from me
PM sent
best regards
Pier Paolo
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: hikowinter on August 07, 2019, 09:11:19 AM
Do you have DIP8 version of APP992?
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: ppa on August 07, 2019, 10:01:58 AM
I have the ver.2 under developtment (with higher performances), but I should do it with my new test board. On the next week I should have it.
I will keep you posted soon,
thanks for contacting and for you interest.
best regards
Pier Paolo
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: hikowinter on August 07, 2019, 11:39:29 AM
I have the ver.2 under developtment (with higher performances), but I should do it with my new test board. On the next week I should have it.
I will keep you posted soon,
thanks for contacting and for you interest.
best regards
Pier Paolo

Sounds good!
Is that available for replacing TL072 or OPA2134?

Thanks,
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: ppa on August 08, 2019, 04:42:14 AM
Sounds good!
Is that available for replacing TL072 or OPA2134?

Thanks,

yes, there are the DIP dual opamp version of the APP992 to replace dual opamps.
My goal is to replace several IC  opamps inside several classic gears as for example the Sontec 250 eqs, AMEK2500..etc..
I have intention to open a topic for this idea as reference manual.



   

 
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: sr1200 on September 24, 2019, 04:11:33 PM
Ciao Piere,

Still interested in 4 of the germanium op amps.  With transistor please.
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: Gurra on October 04, 2019, 12:53:59 PM
Ciao Pier Paolo,

I would be interested in a single MA1 kit. Do you have them in stock?

Gurra
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: ppa on October 06, 2019, 03:42:58 PM
Ciao Pier Paolo,

I would be interested in a single MA1 kit. Do you have them in stock?

Gurra

PM sent yesterday
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: Gurra on October 07, 2019, 11:51:35 AM
PM sent yesterday
Thanks for your quick reply. Replied to the email you gave in the PM.

Gurra
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: barry_es on October 19, 2019, 02:39:28 PM
Hi Pier Paolo

I sent you a PM on oct 6th for an order, woudn't you mind to check it?

Best regards
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: TillM on October 19, 2019, 03:23:33 PM
Drop Pier Paolo a E-Mail.
It’s better then send a PM.
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: ppa on October 19, 2019, 09:31:50 PM
Hi Pier Paolo

I sent you a PM on oct 6th for an order, woudn't you mind to check it?

Best regards

Ops, I had the PM box full so probably I cancelled yours for error, sorry.
I am going to PM you.
thanks
Pier Paolo 
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: hikowinter on October 31, 2019, 11:36:26 AM
yes, there are the DIP dual opamp version of the APP992 to replace dual opamps.
My goal is to replace several IC  opamps inside several classic gears as for example the Sontec 250 eqs, AMEK2500..etc..
I have intention to open a topic for this idea as reference manual.



 

Does DIP dual opamp version of the APP992 finish?
Title: Re: APP Studio Ing's products - OPEN - APP992 - APP14GE Germanium DOA and other kits
Post by: ppa on October 31, 2019, 05:55:41 PM
Hi, I finished the single DIP version of the APP992, for the dual version I have had to modify a bit the PCB to fit fisically better the two DOA's on the same DIP socket.
thanks for the question.
Pier Paolo