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Well, aside from the fact that two different tubes would not amplify symmetrically (remember, in a push-pull amp half the circuit amplifies one half of the signal waveform, the other half of the circuit amplifies the other half of the waveform) there's also the fact that EL34s and 6L6s have...

It sounds like there is something wrong with the MIDI board. All for channel switching buses are set high at the same time. Chances are the either Rocktron or Egnater would have to fix it for you. There may be some proprietary stuff on that board that the average repair shop may not have access...