I want to bias my SVT-II (non-pro) so the power tubes run a little bit hotter. Im looking to get my power tubes to break up at lower volume levels. How much is too much? What should the multimeter read? According to my common sense, I think doing this would shorten the life of the tubes so I'm not going to go totally crazy, I just want to coax a little more dirt out of this thing Anyone done this before with a tube amp? SVT or other?