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After playing for maybe an hour, my Mark V starts to crackle. I notice this is in Full pwer mode, at 45W or 90W. The problem goes away if I switch to Variac power or switch to 10 watts. Any thoughts what the problem is? If it seems like power tubes are the likely culprits, which ones...

Thanks, screamingdaisy, that's some excellent advice. Rolling back Channel 1 volume gives me a lot more freedom to dial in warmth and punch. I had my volume that high so that I could have the volumes on the lead channels be at least 10:30, where I start to get distorted tone that I like, and...

Thanks for all your feedback. My experience is largely consistent with what you are all saying. I still think something may be wrong with mine, because I took my main guitar to the store, plugged into another Mark V combo, dialed it in as usual, then even darker and higher gain, and it...

I find that my Mark V clean channel starts to clip when I dial in any sort of mids. Particularly with the gain past about 11 o'clock, mid past about 11 o'clock, any of the bold settings on, and playing any chords that are remotely dissonant. Has anyone encountered this? If it sounds like a...