I've had my Fender 68 Custom Pro Reverb for three months now. It is very nearly the perfect package: small footprint, lightweight at 35 lbs, 40 watts, all tube including reverb and trem. Like a Princeton Reverb on steroids. The only issue I have is that it starts breaking up hard at between 5 and 6 on the volume control. I like the classic Fender sound - clean to the top. I thought it would be easy to locate and change the negative feedback resistor, but Fender did not put it in the output section where you would normally find it. I called Fender and they do not publish a schematic for this amp and they refuse to help in any way. So I'm wondering if anyone might have a copy of the schematic for the 68 Custom Pro Reverb they would be willing to share. Anyone?