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Aren't they all just standard on/off switches that can be controlled by a generic footswitch that makes or breaks the connection to ground? I suppose if they are, there's got to be some hierarchy as to which one trumps the others if all are "on" at once? And then how does the mode selector...

Thanks! Yeah, my initial hunch was preamp tube. I have a box of 12AX7's to sub in, if/when it happens again. Loving the amp more and more everyday, by the way. Easily my favorite of the few Boogies I've owned.

Thanks, that will be my next step. I actually have not been able to replicate the problem since it happened. Strange.

Thanks. That's a bummer since I just put new Mesa 6L6's in the Class A sockets. Wonder if I oughta return them for replacements?

Hi all, New to the forum - I recently acquired a Mark IV-B widebody combo. Been enjoying getting to know it the last couple of weeks. Today, for the first time, it did something odd - on the lead channel, when I played a high "A" - 10th fret on the B string - the amp would continue to...