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In Reply to: RE: RH84 test amp: driver stage wiring change = lower THD% posted by Triode_Kingdom on September 16, 2016 at 05:46:10
The THD was over 1.5% @ 1.2W the first time I wired up this circuit around a year ago.
Now THD is at .70% @ 1.2W with the circuit adjustments I have made recently , including the driver stage wirings.
You may want to review some of the earlier threads I had posted which noted other circuit/performance changes.
Follow Ups:
"The THD was over 1.5% @ 1.2W the first time I wired up this circuit around a year ago"
No, you reported over 1.5% just three weeks ago. That's why I was surprised to see these numbers suddenly looking better. What happened in-between?
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Buy Chinese. Bury freedom.
My first attempt with an RH type circuit was critiqued by the designer a long time ago.
All those posts are still in the archives.
More recently, I started looking at the RH type circuit again and tried G2 regulation with gas regulator tubes, but the distortion performance and noise was worse than my earlier/first attempt.
After that, I posted a thread that documented some circuit changes that reduced distortion by about 50%.
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