So we start with an Adcom GFA-555 power amp (a big 'un!). I've owned it since I was 10 or 11, used on and off for that time until 2014 I was adjusting the bias voltage or something like that and the probe slipped sending 80 vdc to the left speaker. FF to earlier this year I tested the transistors and found the drivers were only bad, the big TO3 ones can safely pass 150 volts before they smoke. I have the new drivers here, thermal paste, mica insulators.....
Now the victims, amp, one NPN board removed, board getting prepped for cleanup/reassembly. Let the fun begin!
Now the victims, amp, one NPN board removed, board getting prepped for cleanup/reassembly. Let the fun begin!