Tube Amp Archive

Finally tracked down what my problem was. I found a couple more cold solder joints on the board and I also found a ground wire that came off the board that went to the metal frame that had a loose solder joint. I think that the circuit board was flexing up after heating up and making the one ground ...

Thanks. As far as I know, all the parts are original parts. I bought it around 1988 and it has not been repaired/serviced since. I did resoder a resistor that ran the lengthwise of the circuit board. It was popped up from one its joints like you mentioned. I'll try the tube pull.

I have a vintage 1965 Blackface Vibrolux with the AA864 circuitry. It plays fine for a short while but after 15 or so minutes of playing all channels get terrible distortion and crackling. Tapping on the amp causes the same. I assume this is heat related. Any tips for what to look for what is causin...