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I have a friend's .22 caliber from the mid 1980s (PCB says 1985 on it), which supposedly has all of it's original components. I have fixed a handful of blown components (a few resistors) and broken wires/burnt traces, and am now troubleshooting it's functionality. The amp has no output signal...

I am troubleshooting a buddy's Mark V 25 which is working, but with no reverb. I've tried swapping reverb tanks to another Mesa amp, and the tank in the Mark V is fine (and the other tank works, but not in the Mark V either). I am looking at this schematic...