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My Mark III "blue stripe" (obviously) has a blue stripe near the power cord. The previous owner had it modded by Mesa, and it has a red "R" and purple initials "MB", which I believe belong to Mike B. at Mesa. I checked out the work done and it looks like a standard mod was performed that...

Yes the Mark III switching jacks are standard switches that common footswitches can control. The R1/R2 and Rythm/Lead jacks each require a mono 1/4" switch. The Reverb and EQ share a TRS (stereo) jack.

Suspect your output tubes before anything else, as they are the most likely culprit. If you have a spare quad of output tubes, replace all the output tubes and fire the amp up. If you don't have a spare quad, here's what you can do: [1] Switch the amp to "class A" mode and see if the problem...

I have a Mark IV-A. I just replaced the stock FU-3 footswitch with a MIDI switcher -- Voodoo Lab Control Switcher. While playing around with the Mark IV's 1/4" dedicated channel switching jacks I noticed 2 interesting things that were prevented from happening when using the FU-3. [1] All 3...