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Mesa Boogie MESA BOOGIE MARK II
MESA BOOGIE MARK II. 60/100W 1978-1980. BRUGT.BEG The Mark IIB introduced an effects loop and an expanded control panel, featuring both a lead drive and a lead master dial. More importantly, it marked the introduction of Mesa's "simul-class" system, where two of the power tubes (always 6L6s) run in class AB pentode while the other two tubes (either 6L6s or EL34s) run in class A triode. If you have a simul-class amp, running all four tubes generates approximately 75 watts RMS of power, while running only the class A tubes produces about 15 watts. You could also get a non-simul-class Mark IIB in a 100 watt model, which allowed to shift down to 60 watts by turning off a pair of power tubes.
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