(Preface: I use single coil Teles.)  Just thought I'd throw this out there for anybody who likes the Fender Ultra/Ultimate (non DSP) Chorus amps. I did this purely as an experiment but the results were phenomenal. Is it overboard...probably, just buy another amp...probably but if you have some time and willing to spend $50 on the amp, it really pays off. The biggest problem with these amps is the fact that they have cheap electrolytic and Tantalum caps in the signal path, with these removed it is an amazing transformation. Its a simple task but time consuming. All Tantalum caps that were changed were replaced with silver mica. The other polyester caps were merely upgraded. Attached schematic....Red circles indicate upgraded to mica or polyester caps, capacitance size is determining factor, all pico's are mica. BLUE circles indicate an electrolytic cap changed to non polar polyester cap. The yellow square (C6) was changed from 1000pf to 250pf, this one mod was a tremendous difference.

Just got my first JC120 (UT) and I play Telecaster (vintage fralins).....the treble is over bearing. I can almost adjust the treble pot to my liking but I hit a certain point and it falls off too much. The amp is playing and functioning properly but geez its bright. What can I mod in CH2 to tame it some....C4, C16, C8 ?.....or is there somewhere else I should look. speaking of C8, what is 0p exactly.

just picked up a red knob power chorus, everything sounds great except th chorus doesn't work. Took the chassis out to find that the rate pot has been changed out.when turning the chorus on you can hear what sounds like a tone change but no chorus effect and an intermittent static,interference and popping. really bummed out, what should i check for.