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Saurav 11th April 2010 09:42 PM

FS: DIY 2A3 SET amp, or for parts
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I've tinkered with this for many years, and I've recently switched from HE speakers to dipoles, so it's time to move in a different direction. The amp works fine and sounds good, but I'd recommend buying it only if you are comfortable working on it. I don't have a schematic, and there have been multiple mods made over the years, so there will be some reverse-engineering required.


OPT: One Electron UBT-3
PS transformer, choke, heater transformers: Hammond
Caps: PS electrolytes are Nichicon, coupling caps are Russian surplus (I think teflon)
Tubes: Sovtek 2A3s (I have 2 matched pairs, one set is several years old, the other probably a couple of years old), JJ 5AR4 and ECC99s

The topology is pretty simple. It started as a schematic I found on the JE Labs website, then evolved from there. The PS is a common CLC section with (I think) a 10H choke, then RCRC for each channel. The ECC99s have a battery under the cathode, and are RC coupled to the 2A3s.

I probably have around $400 in the iron, I think I once calculated the whole amp to be around $5-600 in parts. I'd like $150 + shipping, OBO. Paypal preferred. All that iron is heavy, so the closer you are to Portland Oregon, the less shipping will be :)

Feel free to post here / PM / email with questions.

ra7 11th April 2010 09:51 PM

pm sent.

d to the g 11th April 2010 10:27 PM

I'll take a spot in line!

mctavish 11th April 2010 10:38 PM

Me three!

Saurav 11th April 2010 10:57 PM

Thanks for the interest. The amp is tentatively sold. If it doesn't work out, I'll contact the next person in line.

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