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In Reply to: RE: I'm not sure I need to adopt it, or that it would get me much more power. The LEAK St20 IIRc used a single R posted by Timbo in Oz on July 20, 2015 at 15:34:42
"Nevertheless this EFB circuit may be a relatively simple way to get even more continuous clean power, though it may need to deliver higher bias to do that."
It doesn't need to deliver more. It only has to hold it steady if long-term average current through the tubes increases. That's what the simple cathode R/C cannot do.
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Buy Chinese. Bury freedom.
Follow Ups:
I get that the power for the regulator comes from the B+, which is neat.
No need for a fixed bias traffo.I will run the articles past Bill and set his quote against the other plans I have for the system.
I'd add that I don't think the stability of bias or longer life benefit is a really big plus to me. EL84Ms are not expensive.Both LEAK St20 amps currently use 4 single Cathode Rs ie one per tube. Surely this makes a difference? yes? no?
More power might be a plus, though I have enough as it is.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 07/20/15
"Both LEAK St20 amps currently use 4 single Cathode Rs ie one per tube."
I personally think that's the worst possible way to bias the tubes. If you don't want to build a bias supply - which would provide the ultimate in headroom - a separate EFB for each channel (pair of tubes) seems the best way to do this.
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Buy Chinese. Bury freedom.
IIRC mine are giving about 9dbw in A IE about 8 watts.
I will nevertheless run the idea past my techie.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
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