Dual La2a - [silent:arts] version

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Dual La2a - [silent:arts] version

Postby [silent:arts] » Sat Oct 27, 2007 4:09 pm

Last edited by [silent:arts] on Thu Mar 03, 2011 6:32 am, edited 22 times in total.
volker
olafmatt wrote:Strom kann tot machen
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Postby ChuckD » Thu Nov 01, 2007 5:57 pm

Here's a link to my on resources on this project.

{removed} by request of Drip
Much respect to drip and all his hard work...
Sorry.


Iron: UTC A10 etc...

T4B : cheapest so far is Drips @ $85USD each. But he was reproducing these himself.


-ChuckD
Last edited by ChuckD on Sat Jan 26, 2008 9:20 pm, edited 2 times in total.
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Postby ChuckD » Thu Nov 01, 2007 6:14 pm

Scroll Down to Drips reply on why he does not offer Kits for these T4Bs
Has to do with the cells and the number of rejects there are when testing.

http://www.prodigy-pro.com/forum/viewto ... c&start=90
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GROUNDs

Postby [silent:arts] » Fri Nov 02, 2007 11:17 am

there are a few differences between the Drip and the [silent:arts] LA2A.

first: GROUNDING
on the PCB there are 4 independend Grounds (each side of audio, PWR and the 5V for the true bypass relais)
at least you MUST connect the audio and power grounds to a star point, best is connected to the chassis and the IEC safety earth (that is the way I did it with NO problems). the 5V ground can be jumpered to the PWR ground on the PCB.

Image

the PCB layout for the GND connectors is for this:
Image

since the molex 3way connectors for in and out are directly connected to the channel grounds just wire the XLRs Pin 1 there (no need for a direct "PIN1 to chassis" in this layout)
Last edited by [silent:arts] on Tue Jan 20, 2009 10:27 pm, edited 1 time in total.
volker
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CAPs

Postby [silent:arts] » Sat Nov 03, 2007 8:45 am

Last edited by [silent:arts] on Sat Nov 03, 2007 8:01 pm, edited 1 time in total.
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Postby bernbrue » Sat Nov 03, 2007 6:12 pm

Hi,
I made a BOM in Excel for the D-LA2. I´m going to include Volkers ordering links and upload it tonight. I consider to use a beautiful pair of old bakelite meters I´ve got here instead of the VU meters , because I don´t need the output level. Can a 1mA Meter be adapted to be used in the D-LA2? The neon lamps, do they have any special voltage? Looking forward to built this beautiful piece of gear. Thx a lot, Volker, for sharing your design. Chuck, the boards are so nice, can´t wait to get them! :)
regards
Bernd
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Postby [silent:arts] » Sat Nov 03, 2007 6:48 pm

NE2 Neon Lamp
65V - or use a 65V zener diode
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Postby waldorfcave » Sat Nov 03, 2007 7:54 pm

muchos gracias :P

at the end of next week i will phone to rondo mueller for the psu trafos...

i´m very excited for this sexy project :love4:
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Postby bernbrue » Sat Nov 03, 2007 8:54 pm

Hi,
here is an Excel Partlist and the pcb component placement as pdf. I mailed DRIP, the price for a T4B remake is 90 USD. Will ask him for a price reduction in case we order more than ten.

http://www.twin-x.com/groupdiy/images/thumb_xls.jpg
http://www.twin-x.com/groupdiy/albums/u ... nlayou.pdf

regards
Bernd
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Postby [silent:arts] » Sun Nov 04, 2007 7:40 am

this link for the parts list will work better:
http://www.twin-x.com/groupdiy/albums/u ... nt_Art.xls :wink:
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Postby bernbrue » Sun Nov 04, 2007 9:45 pm

thx, Volker
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Postby Infernal_Death » Sat Nov 10, 2007 9:51 am

So after receiving the board i am wondering about the transformers. Volker seemed to have used the Sowters. I am sure they are nice but also pretty expensive.
Now i am wondering if you can substitute the 4383 with the Edcor XSM600/10K and the 8940 with the Edcor XSM6K/600 ? Although i just realized that the XSM6K/600 isn't listed on the edcor site anymore, just in the price list i received from TonyDB some time ago so i have to ask if it's even available anymore. Also if it's even a good choice to substitute a 5k/600 with a 6K/500. Don't know how sensitive the circuit is.

The Edcors are supposed to be of good quality and you can get all 4 transformers for the price of 1 sowter so that's definitely attractive. Otherwise i have to postpone this project as i really don't have the money for the sowters right now.

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Postby bernbrue » Sat Nov 10, 2007 10:15 am

Flo,
was thinking about that as well. The other day I saw the "Tube Recording Channel" from Michaels "Tegeler Audio Manufaktur" using OEP as Input- and Edcor as Output-Transformer. The VK1s were already such expensive that another project with 300 bucks for the transformers only seems hard to afford. I'll try to get the T4b for us, build the pcb and case and wait and see.
regards
Bernd
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Postby [silent:arts] » Sat Nov 10, 2007 10:24 am

you find an interesting read here:
http://www.prodigy-pro.com/forum/viewtopic.php?t=22288

for the Jensen mod they use a 10K:10K at the input ...
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Postby bernbrue » Sun Nov 11, 2007 4:37 pm

Hi,
just scored these transformers:

Image

two for the price of one new. :cool:
regards
Bernd
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