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In Reply to: In what way would that improve the amp? posted by Triode_Kingdom on July 10, 2016 at 12:48:36:
If you put a scope on the negative bias supply rail while music is playing,you can see the audio there at the source riding on the filter caps.
Simple logic would tell us that some of that audio signal is probably getting filtered out in the C minus supply since you can see audio riding on the C minus rail. Even tho bias draws very little current and needs very little filtering,wouldn't it make sense to build the lowest impedance C minus rail that you can so you have less of a chance of this happening? When I put a toroid and a full wave bridge in a Citation 2 in place of the original one diode C minus rail,it is noticeably better IMHO and I was almost tempted to add a choke in line as well.Maybe I'm over analyzing this but some of the best home brew and commercial amps I've ever heard use battery bias in the negative bias supply. The last one I heard used series connected nicads..
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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Follow Ups
- Here is what's a bit puzzling about C minus supplies. - Michael Samra 13:24:06 07/10/16 (1)
- Bias Supply Z - Triode_Kingdom 15:27:15 07/10/16 (0)
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