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In Reply to: RE: red plates ... posted by kobasa@xs4all.nl on September 21, 2021 at 11:59:04
ElBlanco (Thanks!" did us a favor and put up
Robert B. Tomer's "getting the most out
of vacuum tubes".
ElBlanco posted this Sept. 19 on this forum.
I read it all. You might enjoy Tomer's
discussion of fixed bias amps and the
history that led up to them.
Today, commercial fixed bias amps track vacuum
tube conduction individually, and automatically
correct bias to get equal idling currents.
Of course, in the case of unequal tubes (always),
the tubes are forced to idle at the same currents
by applying unequal grid bias. While this
arrangement allows the use of unequal tubes, and
also obtains more consistent power output, one must
also admit the truth:
When the incoming signal sees different bias on
supposedly "balanced" (current-balanced only), tubes, guess
what happens to your signal when it encounters
unequal grid bias on different tubes?
You guessed it: smeared music.
-Dennis-
Follow Ups:
Quoted:
When the incoming signal sees different bias on
supposedly "balanced" (current-balanced only), tubes, guess
what happens to your signal when it encounters
unequal grid bias on different tubes?
You guessed it: smeared music.
End quote.
I just love how y'all think you understand, and generate plausible sounding justifications, and yet are so completely wrong. Keep right on illustrating this for us Mr. Tube Amp Salesman.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Salesman is generous. How many do you think he has "sold". I see them
Used occasionally. From Steve who can't seem to unload them.
Edits: 09/21/21
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