Sorry to keep bumping this but.... Replaced Tl074, that's the offset 'corrector'? No change.

So instead of asking for magic answers, can anyone tell me if these troubleshooting plans are effective?

1. Can I remove all the Transistors on the + rail side to see if one of them was defective when replaced? Or will this fry the O.P. entirely due to imbalance?

2. Can I lift the emitter leg of q3 to measure the voltage on it? Would this damage the transistor, or instead let me measure the isolated voltage before it hit the OP trannys?