DIY st35 Board question

for the DIY ST35, the Dynakit and every other PP EL84

DIY st35 Board question

Postby vintage » Sat Jul 05, 2008 12:57 pm

Ok so I have followed the instructions quite well, ordered the parts and installed them. I got a chassis from triode electronics, along with some other items for the finishing touches.

But I have run into a big problem, I can't seem to find any information about wiring this thing up. I used dynaco transformers from a sca35, both power and output. I would be very happy if one of you fine tubeheads could lay it out for me, real easy like. See if you can dynaco up the instructions so anyone can do it. Remember I have no wires attached inside the chassis as this seems to be the point where the instructions stop Yellow_Light_Colorz_PDT_09 . Thanks guys.
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Postby Ty_Bower » Sat Jul 05, 2008 1:39 pm

The wiring layout should be on page 14 of the manual:

http://www.diytube.com/phpBB2/viewtopic.php?t=837

Tom has a good photo of the wiring at the top of his page, too.

http://tmamps.com/
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Postby vintage » Sat Jul 05, 2008 11:35 pm

Thanks for your responce, I will try to follow this diagram. However I don't recall so many red wires with the cloth lead power tranny. I will take another look tomorrow.
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Postby Shannon Parks » Sun Jul 06, 2008 6:04 am

The secondary center for the cloth leaded PA774 will basically look yellow or dull brown, instead of red/yellow. I think there was a little bit of red in there forty years ago. ;)
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Postby Ty_Bower » Sun Jul 06, 2008 6:45 am

I missed the part where you said they were Dynaco originals. I assumed they were new reproductions from Triode.

Here's a DIY ST35 chassis I assembled using original Dynaco transformers. Unfortunately, many of the leads were too short and I had to add extensions. The colors I used were somewhat random, so follow them carefully.

Image
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Postby vintage » Sun Jul 06, 2008 10:45 am

thanks for the fantastic help, I should be able to complete it now. One last question as I have a c354 choke kicking about, what resistor is this intended to replace on the board.
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Postby Ty_Bower » Sun Jul 06, 2008 12:25 pm

R34 and R35. They are the resistors close to the UF4007 diodes.
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