On the other hand, anything that needs much work/component swapping is probably not economical for this out of warranty amp! Is there anyone out there that can help please? Is there a simple/obvious fix for what seems to be a reasonably common problem? I could change the tube in the pre-amp, but I'm not convinced that this is the problem. I've done a bit of research and found several references to similar problems (including YouTube clips such as this: ), but no definitive solutions. Either way, it makes the amp pretty unusable at any sort of decent rehearsal volume. I'm not in any way qualified to work on these things (I just play them!), but I'm guessing that this tells me that the hum is occurring somewhere in the power amp stage, my assumption being that this isn't involved when listening via phones. The hum can only be defeated by plugging into the headphone jack and there is no noise when listening via phones. The hum exists regardless of whether any input lead is in the amp and increases in volume with rotation of the power level control (0 to 60 watts). However, having decided to use it a few days ago, I discover that it seems to have developed the dreaded mains hum problem. I bought one a while back for home recording/practice sessions and haven't really used it much. I've found many references to what seems to be a problem with these Vox amps.
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