>Silverface Fender with a 6V6 power section.
  >What's the normal bias that most people set it to? Would it
  >hurt to jack the potential up about 10V? Would it even
  >make an audible difference?
There's one (mildly amusing) bias-setting method that goes like this:
1. do it in the dark  (applicable to most things, except surgery)
2. advance the bias til the plates glow cherry red
3. back off a bit til they don't glow
This can also result in:
4. buy some new tubes and go to #1.
There's a range of `acceptable' values.  Whatever sounds good without
glowing tubes is a pretty good solution.  But get the real range first,
so you have somewhere to start off.
P.S.  They are reputed to sound WONDERFUL right before they blow up.
  >       So, this confirms my belief that Leo did know a lot
  >more about what he was doing than CBS. :) Like it really
  >needed to be confirmed, though. :)
Leo:  build a good amp
CBS:  we have to take all that nasty distortion out of the circuits
  >portion of the market. My question is, though, why the
  >hell is the Twin so damned clean and loud back in the
  >Silverface models with the B+ that high!?!? :) But the Twin
  >is running 6L6GCs, though, so that's a small part of it...
Output wattage, I believe, is a function of (among other things) B+.
You'll get more of a `brown' tone from less B+
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