So, I picked this up last weekend, with the owner saying the usual "worked fine that last time I used it", but expecting otherwise. So far, I've found: Power button has a broken stud; will need to replace switch Tape monitor circuits keep playing source when depressed Volume control cuts out in weird ways*, and can be jiggled in position. Going to clean and hit all of the solder joints first, then tighten up and test again. Even though there are no jumpers in the Pre-Out/Main In jacks, the signal passes thru. Are there internal jumpers that go into place when there are no cables inserted? * Left channel has low channel and no bass, but wiggling it into the right position gets full sound back Plans: Full cleaning of switches, controls, and connectors Replace power supply switch Review volume control, clean resolder and test or replace Relamp and replace vellum Check bias and DC offset Short of a full recap, what else might I be missing?