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In Reply to: RE: how about this one? posted by vinnie2 on November 19, 2014 at 10:24:32
that circuit also uses UL taps.
connect the screen of the output tube to the plate of the output tube with a 100 ohm resistor. remove feedback. everything else stays the same.
I'd actually use a different phase splitter. the phase splitter in both of those amps is a "floating paraphase".
some people like em.
I like an LTP/differential pair. LM334 in the tail. 68 ohm resistor for the 12ax7. probably would work for the 6sl7 too. 68 ohm resistor sets the CCS in the tail to 1ma. both halfs of the driver tube are tied together, the LM334 is a constant current sink to ground. gives better balance than floating paraphase.
Follow Ups:
Do you mean connect G2 to the plate with a 100 ohm resistor? What is the feedback I need to remove? I have never built an amp that used feedback so I don't know what it looks like. Is it G3 back to the cathode?
yes g2.
for the feedback, global feedback loop is from the secondary of the output transformer to the cathode of the 6sl7.
might want to try it both ways, with and without feedback. it's not needed in "triode mode" but will reduce gain and change the sound a bit.
I see. Great, I will give it a try.
Thanks!
Dang, you're right. I missed that. Well if I am going with triode mode I might as well try the 6v6.
Thanks
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