APP Studio Ing's products - APP992 - APP14GE Germanium DOA and other kits

[Davidmccomb]

Pier,

I would love to order one of your MA1 medium kits now that they are back in stock.



Dkm

 

[creal]

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

 

[ppa]

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
 

 

[creal]

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.

 

[ppa]

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

 

[ppa]

check please if D5 is inverted too, also put a 15k/22k resistor on +48V out. 

 

[creal]

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

 

[ppa]

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

 

[ParkOne]

Hi PPA
just send you an email to confirm an order.
Many Thanks,
a+

 

[alexc]

Hi

Could someone please point me to the docs (schematic, bom ?) for the PSU2 pcb.

I have some APP Studio pcbs to build!

Thanks

 

[ppa]

Hi

pm sent

Pier Paolo

 

[ppa]

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)

 

[ppa]

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

 

[ppa]

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)

 

[alexc]

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

 

[ppa]

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

 

[ppa]

Ciao !...at the end here some APP1060's picture ( MA1's rack version) that  i've built

i've made with AF127 germanium Transistor, Classic api 2503 out transfo and silentarts's Haufe St8456 input transfo

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

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.   

 

[tonedude]

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

 

[ppa]

Hi Mattias,

I have just sent the email with the total

regarding the dip version i have just some available

thanks
regs
Pier Paolo 

 

[tonedude]

Thanx!