Just repaired a JCM600 and notice the volume level on the clean from front panel switch is very low in level. When switching to overdrive level has plenty of volune. Notice that the schematic shows what looks like a signal from pin 1 and from pin 5 on the input jack. The jack from the guitar...
Forgive me if this is the wrong forum to look for repair help but here goes.
I am working on a Fender SR circa 1969, original condition to begin with.
I have replaced all the power supply caps. I have replaced the back half(phase splitter on) of the coupling caps. The problem is that the owner...