Phantom Audio

Old school Adcom 5450 in need of a little help. Previous repair attempt destroyed the via on one of the 15v power caps and a few traces. Customer was still experiencing random amp shut down and sent it to us. We knew there was a bias in the circuit but not sure where from. We cleaned up the board and began testing. The previously damaged section of the board was still the source of the issue. A bad Zener diode. Initial, and basic, test shown it was doing its job; however under a load we found a 3v bias issue effecting the 044 transistor. The braided solder wick was removed and proper via was placed. The amp was recapped, the IRFP044 was replaced along with the bad Zener and the trim pots were set to the factory specs. We let it run hard for 18hrs without issues. Love these old amps.