Neil

LA2A PCB ver 2.0 build thread
« Reply #20 on: February 17, 2007, 01:44:06 AM »
Great job on the Ver 2 pcb and manual!

I'm down for a couple of V72s when you get that going, keep us posted.

And did I hear Fairchild 660? Can't wait to see that!

Neil


dripelectronics

LA2A PCB ver 2.0 build thread
« Reply #21 on: February 17, 2007, 04:11:46 AM »
:thumb: im thinking by summer or fall  i will be purchasing the 660 to begin dismanteling it .

it's half the price of a 670 , but the 670 does have the stereo image section , wich i might need to reproduce.

manley designed a 'T' bar replace ment for the
super expensive tubes,

and sowter has already designed all the x formers.

i love the sowter folks <3

i dont trust schematics for anything , there are always wierd subtle
things that are not showing how it's really done.

for example the la2a would be a real pain in the a$$ based off of
schematics the ground structure alone is so damn finicky about how it wants to
be.

so if all goes well 660 , but if things change its 670.
then comes the pcb / and the book. :)

*fingers crossed*



i know im going to hell for using that logo , lol
g.

[email protected]
(not so good with PM's so dont pm...use email)
la2a ver 3 atoms manual : http://lomayesva.com/la2a_pcb_ver3.pdf
v72 manual : http://lomayesva.com/v72_pcb_manual.pdf

louder

LA2A PCB ver 2.0 build thread
« Reply #22 on: February 17, 2007, 09:01:08 AM »
Hi
so,do you have ver2 for sale,with t4b?.
if so i want two.
best regards
pedro

kazper

LA2A PCB ver 2.0 build thread
« Reply #23 on: February 17, 2007, 01:40:00 PM »
I am down for 2 units of version 2.

Stick with the heavy boards, offer what you got done. If you think about some of the caparison projects costs your right in line with them based on exchange rates etc.. plus your excellent how to's set the bar rather high.

I said all that to say this, I'm in for 2 units (version 2 boards and T4B) but I've been waiting for you to say the T4B are cool. Been watching them come and go on the bay but would rather spend the money with you. Looks like your there but now I have to wait about 4-5 weeks till I have the funds.

Kevin S.
Intentionally left blank

ECC82

LA2A PCB ver 2.0 build thread
« Reply #24 on: February 17, 2007, 11:07:49 PM »
What would the total cost (not including the case) be for building an LA...ehh ( :wink: ) I mean Drip opto-compressor?

Best regards

mikka

LA2A PCB ver 2.0 build thread
« Reply #25 on: February 18, 2007, 01:41:10 AM »
Quote from: "dripelectronics"
i know im going to hell for using that logo , lol
Change the "n" and the "k" around.....

dripelectronics

LA2A PCB ver 2.0 build thread
« Reply #26 on: February 18, 2007, 03:01:50 AM »
great idea with the TELEfUNken
 :razz:
i have enough panels for 10 t4bs at the moment .
then it will take 4 weeks to get the rest of the panels.
untill i get cells made ,prices will be higher due
to loss rate.

pcb ver 2. : 80$ (shipping usa 10 / int 15)
t4b : 70-80$ (fast / slow) shipping 5$
tubes and sockets: 55$
mouser : 50$ (caps/parts/xlrs/ne-2/fuse/in4007 etc.)
radioshack : 5$ switches and stand offs
allied elec : 32$ (10uf cap / usa power xformer)
sowter/ prodigy pro : 65$ input xformer pcb mount
sowter/prodigy pro : 100$ output xformer pcb mount
digi key : 50$ pots (x5 pec 2 watt)
resistors : 10$

aprox $537us
with out case

g.
g.

[email protected]
(not so good with PM's so dont pm...use email)
la2a ver 3 atoms manual : http://lomayesva.com/la2a_pcb_ver3.pdf
v72 manual : http://lomayesva.com/v72_pcb_manual.pdf

tommypiper

LA2A PCB ver 2.0 build thread
« Reply #27 on: February 18, 2007, 01:27:49 PM »
Great.  Apologies if I missed it in another thread, but to clarify, you were working on a stereo version, I believe.  How is that coming?  And how easy is it to stereo link the v2 boards - stereo linking them in two separate chassis?
Imagine a wet, slightly chilled from its gas release and decompression, with water droplets condensing, sucking surface tension, slowly sliding down the side, capped by a healthy virgin froth on top..

LA2A PCB ver 2.0 build thread
« Reply #28 on: February 18, 2007, 03:32:33 PM »
Well,
 I gotta' say, I did one of the Drip Electronics la-2a 2.0 pcb's and it's amazing sounding. I had a little trouble with some trouble shooting and Gregory was super kind to help me out.

The case and front panel came from Tat Purusha. I have one more La-2a to build. Bottom line, it sounds great!

Big props to Gregory!

LA2A PCB ver 2.0 build thread
« Reply #29 on: February 18, 2007, 03:44:34 PM »
I like that this version seems to have more space for Orange Drop Caps.  Is was a bit tight on the V1.


Stagefright13

LA2A PCB ver 2.0 build thread
« Reply #30 on: February 21, 2007, 10:36:02 PM »
Where can I get the meter and case pictured?

Thanks
Amateur experimenter

ruairioflaherty

LA2A PCB ver 2.0 build thread
« Reply #31 on: February 22, 2007, 12:25:44 PM »
Quote from: "Knarleybass"

The case and front panel came from Tat Purusha.


Meter looks like a Sifam AL29 (just guessing)

cheers,
Ruairi

misterbill

LA2A PCB ver 2.0 build thread
« Reply #32 on: February 25, 2007, 11:08:39 PM »
Version 2 looks great!

Count me in for (2) ver. 2 boards and (2) T4b's

Thanks.
MisterBill

Stagefright13

LA2A PCB ver 2.0 build thread
« Reply #33 on: February 26, 2007, 09:35:00 PM »
Got board and looks great! Thanks!
One quick question tho. The bom says c10 is 47uf @ 25 volts but board says 100 uf @ 25 volts. I put the 47 there. That's the reissue value right? Also I can't find the 6.8k resistor listed in bom on the board. LA-2A schematic says it is R23. Oh and having trouble finding a tc72 mallory 10 uf if anyone has one?
  OOps that was 3 questions! :)

Thanks
Amateur experimenter

Pierrelegere

?
« Reply #34 on: February 27, 2007, 06:13:40 AM »
I still have two older pcbs(LA-2A PCB REV10) and I wanted to start that project soon, should I still use those? Or do I have to get the Vers.2 pcb? Are there a lot of bugs in the older version? I also really like the manual for the re-designed pcb (absolute amazing job!),  are there any major differences? Thanks!!

Pierrelegere

LA2A PCB ver 2.0 build thread
« Reply #35 on: February 27, 2007, 06:23:26 AM »
I mean, I see the differences in the two versions... the question is: if I start a project like this and invest time and money for parts, would you suggest to take the new board? Have some of you made experiences building the "old" version wich would justify buying the "new" version?
Thanks!!

dripelectronics

LA2A PCB ver 2.0 build thread
« Reply #36 on: February 27, 2007, 08:26:23 PM »
hi there ,

there is no -10 metering on this board.
most people never used it , so i took it out to save the often
confussing meter hook up problems.

i can pull a mod diagram togeather , if you would like it back

thats what the 6.8k resistor is for .

as far as the c10 , i find both values will work ,
but you are correct why i changed the value in the bill of materials.
------------------------------------------------------------------------

the ver 1 board is a good board ,

the ver 2 is a whole new beast in it's self , over all it out performs
the v1 board and is built to a different class.

i would be happy to refund your money and apply it towards a ver 2
board if you would like ,  of course the v2 costs more.

contact me through email if you  like.

otherwise your v1 is very cool too.

i explain what the v2 board is all about in the begining of the
opto compressor build manual.

best ,

gregory
g.

[email protected]
(not so good with PM's so dont pm...use email)
la2a ver 3 atoms manual : http://lomayesva.com/la2a_pcb_ver3.pdf
v72 manual : http://lomayesva.com/v72_pcb_manual.pdf

wmb

Drip board v2
« Reply #37 on: February 28, 2007, 07:24:59 PM »
Hello all,

This is my first post on this board after months of lurking. I just received my drip/OPTO ver 2.0 PCBs. Stunning work and satisfyingly large in a fisher pricey christmas sort of way. Made me want to buy two more!

More parts to arrive over the next few days.

Cheers, William

Stagefright13

LA2A PCB ver 2.0 build thread
« Reply #38 on: February 28, 2007, 07:41:29 PM »
Thanks for the reply Gregory. -10 metering is not very useful to me so a mod is not nessessary. My board is done already just about woohoo. But I still need the in and out trannies and a meter. Hope to order them soon. I also ordered a couple cases from Tat Purusha. Can't wait lol!
Amateur experimenter

wmb

c10, grid, c4
« Reply #39 on: March 06, 2007, 07:44:51 AM »
I've nearly stuffed the entire board and I have a few questions.

1. C10 is listed as [email protected] but I think the BOM calls out a [email protected] Cross refernecing a very old schematic (has a T4a in lieu of a T4b) it lists a [email protected] so I figured 47 was okay. Is it okay or did I misunderstand something.

2. The two places marked "GRID" near the 12bh7 are for grid resisters to stop oscillations with sowter iron. I think they are 1k and that's what I put there but should I wait to see if oscillation is a problem or is it a given with sowters?

3. C4 ARCO is listed as 68pf but the BOM suggests a 150pf as a fixed value. Is 68pf an error? Just curious.

Other than those questions and waiting for parts it has been enjoyable so far and going smoothly.

wm.


 

Related Topics

  Subject / Started by Replies Last post
7 Replies
4501 Views
Last post June 01, 2007, 12:40:42 AM
by rodgre
76 Replies
25060 Views
Last post November 03, 2010, 01:51:16 PM
by pH
3 Replies
2706 Views
Last post January 13, 2009, 11:25:19 AM
by Arrigotti
7 Replies
2515 Views
Last post January 27, 2009, 08:30:16 PM
by Bill Kahler