[Jukebox-list] Moron vacuum tube question.

[David Breneman]

--- Ron Rich <ronnnrich at yahoo.com> wrote:

> To my ears, I don't think you loose more then 25%, nor have I
> detected distortion, however, the "good" tube is doing much more
> work then it was designed to do. 

I think there's a certain logarithmic response in human
hearing that leads to this perception.  Theoretically, one
tube of the push-pull pair drives the audio signal from
zero voltage to the peak positive point of the signal,
the other from zero to the peak negative point.  Removing
one tube, however, does not result in a "single sideband"
signal because the zero point is relative to the peaks.
So a new zero obtains in relation to the peaks generated
by the remaining tube.  Unlike early amplifiers which
used a series of tubes to each boost the signal a little,
push-pull amps are more efficient since there's sort of a
feedback-loop in effect rather than simple boost-the-signal-
a-little with each tube of the old design.  And that's
about where my knowledge of thermionic valve circuit
engineering peters completely out...  :-)



David Breneman         david_breneman at yahoo.com


       
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