>I have double checked all the external connections to the tank. This was unusual, I can't recall hearing the same humming before. Turning the reverb knob to zero solved the problem. >Oh, at one point the amp started to hum badly for a few seconds. I don't think that impacted this problem. The problem can be heard at just about any point in its rotation except zero. >The reverb pot is quite noisy when I turn it. it is severe distortion, but it's not musical at all. >The 'breaking up' sound is hard to describe. They seem solid.īad tube? (this one seems unlikely, since a replacement didn't help)īad something else? If so, any ideas what the tech should be looking for? I have double checked all the external connections to the tank. Oh, at one point the amp started to hum badly for a few seconds. The reverb pot is quite noisy when I turn it. The 'breaking up' sound is hard to describe. As I turn it louder it will start breaking up on other notes.Īt any given time I can turn the reverb knob to zero and the problem goes away. The first thing that happens is that it breaks up on F (E string 13th fret, but also B string 6th fret). If I turn it louder than that, the amp will start to break up.

With the reverb on, the amp sounds fine as long as it isn't very loud, meaning quiet bedroom practice volume. I think the problem has been intermittent in the past so that the tech might have thought he'd fixed it. I'm hoping to get some idea of what it is before I take it in again. I've had it in the shop twice, but this hasn't been fixed. This is a 1964 amp, solid state rectifier. Any ideas about this would be appreciated.

Ampeg reverberocket tube layout