Onhwy61,
That amplifier can be tweaked very easily, most don't know.
Removal of the top allows access to (I'm going by memory) five white nylon setting screws. Two of which, will adjust the Gain amount.
CAUTION: Turning up the wrong ones can result in possibly frying the board or such. I
would imagine the information is easily found online.I had adjusted mine at least a few times. Great Crunch!!