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- similar to the MK-II(A), except has an effects loop and Mesa/Boogie's patented optional Simul-Class system, serial numbers 5,575-11,000, mfg. 1980-83.
Mesa/Boogie's patetened Simul-Class power tube system utilized two separate sets of power amp tubes instead of running all four the same way. In Simul-Class Two 6L6 tubes operate in Class AB pentode and two other 6L6 or EL34 power tubes operate in Class A triode. Simul-Class was optional on the Mark IIB, and models without it will have the standard 60W/100W power switch.
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- 60 or 100W, 1-12 in. or optional 1-15 in. speaker, guitar combo, eight-tube chassis, preamp: 4 X 12AX7, power: 4 X 6L6GC, two switchable channels, optional reverb, front black control panel, single input, footswitch jack, seven black knob...
- similar to the Mark V Head (40th Anniversary), except in combo configuration with 1-12 in. C90 speaker, mfg. 2009-present.
- similar to the MK-IIB, except in head-unit configuration, mfg. 1983-1985.
- 60W/100W, guitar head unit, nine-tube chassis, preamp: 5 X 12AX7, power: 4 X 6L6, three switchable channels, 15 modes, spring reverb, front black control panel, single input, 18 black knobs (each channel: g, MV, p, t, m, b), EQ switch for...
- 85W, guitar head-unit, nin-tube chassis, preamp: 5 X 12AX7, power: 4 X 6L6, solid-state rectifier, Simul-Class power section, three channels (rhythm 1, rhyhtm 2, lead), reverb, front black control panel, single input, eighteen black knobs...
- 35W (switchable to 25W/10W), guitar head unit, ten-tube chassis, preamp: 6 X 12AX7, power: 4 X EL84, two channels, six modes, reverb, front black control panel, single input, 14 black knobs, Channel 1 controls: g, t, m, b, p, MV, solo, cl...
- similar to the Mark IV Head, except in combo configuration with 1-12 in. Original EVM 12L speaker, mfg. 1990-2008.
- similar to the MK-III Head, except in combo configuration with 1-12 in. speaker, mfg. 1985-1999.
