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In Reply to: RE: RH84 test amp: driver stage wiring change = lower THD% posted by Tre' on September 15, 2016 at 20:03:57
I should have noted on the schematic that I used a common PS for both channels.
There is the 1K R dropper and 50uF cap that provides driver stage B+ for both channels.
Sorry for the confusion, this circuit is still a work in progress.
Follow Ups:
My guess is what you are measuring is actually less crosstalk. Crosstalk could manifest it's self as distortion on your analyzer.This is not a case of doubling wires in milliamp circuits making improvements. What you are now doing is providing a separate voltage drop circuit for each stage rather than sharing it.
That has some merit as you have measured.
Edits: 09/15/16
I wondered about crosstalk as well.
Thanks for the comments.
It could also be less noise with your modification as well.
Hard to say without seeing and working with your layout.
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