I recently got a Fender 75 in pretty good shape. I had one in high school and getting one again brought back memories (not all of them good). I want to fix this amp up and it has a number of features I like (like 1/4 power switch). Before I go into spice modelling extremes on this funky circuit, are there mods out there that I can implement to try and fix it. Basically my complaint is the distortion is pretty undefined, even for preamp distortion. I think a PPIMV and some lower gain tubes may help, but I'd be interested in ideas.