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Same here; about four months old, very light home use, not moved anywhere. Local dealer charges $22 per preamp tube, I'm hoping this isn't routine.

Strange noise! Definitely NOT an expert here, but a couple of thoughts: - there's a rhythmic quality to the noise... do you have a stompbox or preamp with a tempo circuit that's not well-grounded? How 'bout something new plugged into power in your house? - (FWIW all my guitars have passive...

It took more than three-and-a-bit hours for people to read and respond to your post... shocking! :shock: Haven't studied it the way you want to, so all I can offer is that Alex Lifeson is another MKV user. When he isn't using Hughes and Kettner, that is. Sorry, don't know history, what...

I know just enough not to kill myself, but this is a nearly-new amp and I don't have a schematic for it (where did you get that?) so it's off to the hospital for warranty service. I'll let you know the issue when I get it back. Thanks again for your time.

It's called a Snap Jack... the ends of the cable click onto the connectors magnetically. Purchased with extra plug connectors, the cable makes it easy and less-noisy to move your cable from one guitar or amp to another. They're available with straight or right-angle plugs. If you magnetically...

Apeman, thanks for your time, interesting idea. Hoping that I understood your advice properly, I went down to fiddle. The FX loop and the external (RJM) switcher and devices it controls seem to work fine on channels 1 and 3. While testing I noticed that channel 2 is not completely dead as I'd...

Channel 2 on my MKV has gone dead, the others seem fine. I called Chris at Mesa last week, and he quickly thought that the V2 tube would be the problem. No joy. I wanted a spare tube anyway. I've been hearing white noise and buzz on all channels for a while. Since I've been putting together...