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In Reply to: RE: Should I re-bias Cary SLI-80 when replacing rectifier tubes and/or posted by Terry P on July 24, 2015 at 14:49:57
Every fixed bias amplifier I have owned or seen is adjusted with everything powered up, playing music. Whenever i switch power tubes, i hook up my DMM and test each tube periodically until the bias i set is stable.
I'm not doubting the Cary procedure. I just don't understand it.
Follow Ups:
Powered up yes, but not playing music. This is Idle Current you are adjusting, so the amp must be idle.
Wherever you got that information from is wrong.
Dan Santoni
Dan is spot on.
"A lie is half-way around the world before the truth can get its boots on."
-Mark Twain
At idle, they both read far too low and can't be biased higher. I wonder what's going on?
What amp? There a number of reasons for low bias current.
Dan Santoni
Two custom made DIY PP amps, one by Jeff Larson and the other by Peter McAlister.Both sound very good.
I don't know the Jeff Larson, but the McAlister's lack of bias could be anything from changes he made, variations in tubes or his poor build quality.
Typically when you can't get bias current high enough it's too low a plate voltage, variation in output tubes or bias voltage too high overall.
Dan Santoni
I had the amp rebuilt by a tech. It sounds lovely.
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