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Date: Fri, 31 May 2002 16:28:02 -0500
From: JJTHAD~lash.net
Subject: Re: Preamp tube subs revisited (was: Bassman '59 RI)

Chris Hammond wrote
>
>...lowering the gain
>in the preamp section allows you to crank the main volume
>up much higher without feeding back. The effect is
>definitely that you get more power tube saturation
>without feedback, thus giving you the "desireable
>distortion".

Something just doesn't jibe here. Just because the volume knob
is set to a higher number doesn't mean the power tubes are
receiving more input signal strength. the amount they receive,
and thus the degree to which they are saturated, depends both on
that setting and on the amount of signal outputted from the
preamp stage. That amount will depend on the gain of the preamp
tubes.

There has to be some other explanation for why some lower-gain
preamp tubes are reported to increase loudness before feedback.
My favorite one is that the player has better volume-knob control
in the critical, pre-feedback range. Another explanation might
be the one proposed by fjm, that different preamp tube types and
makes accentuate different frequencies preferentially.

John Thaden