Members inscho Posted March 24, 2006 Members Share Posted March 24, 2006 I bought a 67 bandmaster from crusty cabs a month and a half to 2 months ago. When the amp arrived I didn't have a speaker cabinet, so I went to guitar center to plug it into a marshall cab of theirs just to see if everything was fine. Completely quiet. Everything working fine. Finally I got my speaker cab yesterday, hooked everything up and turned on the amp. when I switched it off standby there was a fairly loud 60-80 cycle hum. I turned it off unplugged my cable, turned it back on same thing. There was also a cracking/sputtering noise that faded in and out. I tried different outlets in different rooms, different cable, tried all 3 positions of the ground switch, etc. Still no luck. Even when its on standby you can hear hum faintly When I bought the cab I was told that it had been fully serviced, and he is a very respected cab builder so I wouldn't think it was a cap issue. And it hasn't been played on or moved in about a month. I have changed out tubes and no luck there. Here is what steve/crusty emailed me saying: "When I serviced it, I replaced all the electrolytics in the amp. They're usually the only ones you want to replace, because they dry out after a certain amount of time, and they don't affect the tone of the amp. Replacing tone caps is generally done only when one has drifted way out of spec, as to cause abnormal operation, or gone belly up completely. The hum I'm not sure about. Could be a tube. The crackling definitely sounds like a tube, or maybe the plate load resistors. I can't remember now whether I changed them out or not. I don't remember what I sent out in that amp. I gave it a good workout before I boxed it up, and it performed fine for me." Steve any advice would be helpful. Link to comment Share on other sites More sharing options...
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