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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Not really looking to deal with posted by Eli Duttman on August 15, 2014 at 20:11:32:
I built a push-pull 6V6 ultralinear amp with used Dynaco Z-565 outputs and a single, current-sourced, long-tail differential 6SL7 driver. I used some 0.22uF Facon paper-in-oil coupling capacitors.
There's barely enough excess gain to provide any negative feedback. The amplifier has a nice midrange but sounds pretty shut-in. I might try changing to poly coupling caps to see if it opens up a bit. The amp makes about 11 Watts per channel.
This was a junkbox project and I've never tried to optimize it. It was supposed to be a loose adaptation of Poindexter's "Musical Machine."
IMHO, not really a success. Listenable, but not extraordinary. I know, not what you were looking for, but sometimes it's good to have a data point, even if it's not a positive one.
I think adding another stage of gain would lower the distortion and give a more incisive sound. If you're going to run almost pure open-loop, you probably want a very linear output stage. And a more robust driver tube.
LOL.
-Henry
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Follow Ups
- RE: Not really looking to deal with - op48no1 20:31:09 08/15/14 (2)
- Nice amp! - Triode_Kingdom 21:35:29 08/15/14 (1)
- RE: Nice amp! - op48no1 08:55:55 08/16/14 (0)
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