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In Reply to: RE: Anyone try undadjustable fixed bias? posted by DAK on August 30, 2015 at 23:19:41
I would never build an amplifier with non-adjustable fixed bias. In fact, I think most push-pull amps don't have enough adjustments. I'd like to be able to not only adjust the bias per pair, but also per tube (for balancing).
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Buy Chinese. Bury freedom.
Follow Ups:
If you're not in deep Class A, you would also do an AC balance for transconductance differences, to maintain low direct current in the output transformer during loud passages.
Sure I used to feel that way. But, now I would rather worry about what music I will play next rather than if the tubes are balanced to the nth. degree. I mean if cathode bias sounds great and while the output pairs are supposed to be matched, I doubt if in real life that the output pairs are well matched at all. And all those juke boxes and organ amps that operated in fixed fixed bias they sounded just fine. cheers, Dak
"all those juke boxes and organ amps that operated in fixed fixed bias they sounded just fine"
No they didn't. They were mid-fi. That's not what most of us aspire to build.
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Buy Chinese. Bury freedom.
That was a sweet amp. It was my daily driver for 2 years until some crack heads stole it. It was a sad day in stereo land, I must say.
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