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In Reply to: RE: Everything in moderation? posted by megasat16 on July 13, 2016 at 23:03:09
Two things caught my attention in this "sub-thread." First, semiconductor diodes and rectifiers are not active devices. (I assume the reference was to semiconductors, as "valves" was a separate item.) Second, tubes are not more thermally stable than SS. No one would even think about building a free-running HF oscillator using tubes if stability was the goal. I have also seen audio tubes like the 6BL7 and others exhibit slow current drift (with constant voltages applied) requiring more than half an hour to stabilize. This would be unacceptable in its SS counterpart. Just sayin'...
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Follow Ups:
I stand corrected and thanks for correcting my mistake. It's funny how I forgot and still make the same mistakes in this past 20 years of calling diodes and rectifiers as active devices. They are passive semiconductors. But I think they can be just noisy as an active devices when it comes to thermal noise.
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.Thou shall not stand where I type for I carry a bottle of Certified Audiophile Air and a Pure Silver Whip.
Don't most SS PP output stages have active offset sensing (or transistor temp sensors) and servo circuits that are continually adjusting the bias to prevent thermal runaway?"
Tre'
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"Still Working the Problem"
Edits: 07/14/16
Self-heating and susceptibility to same are very much dependent on the specific application. Tubes and transistors each have their caveats in this regard, so I don't think any generalization is accurate.
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