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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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- 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...
- 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...
- 90W (switchable to 45W or 10W), medium width guitar head unit, 12 tube chassis, preamp: 7 X 12AX7, power: 4 X 6L6, switchable 5U4/solid-state rectifier, three channels, three modes, reverb, front black control panel, single input, 23 blac...
- 25W (switchable to 10W), small width guitar head unit, eight-tube chassis, preamp: 6 X 12AX7, power: 2 X EL84, two channels, six modes, reverb, front black control panel, single input, 12 black knobs, Channel 1 controls: g, t, m, b, p, MV...
- similar to the Mark V Head (40th Anniversary), except in combo configuration with 1-12 in. C90 speaker, mfg. 2009-present.
- similar to the Mark IV Head, except in combo configuration with 1-12 in. Original EVM 12L speaker, mfg. 1990-2008.
- 100W (switchable to 60W), guitar head-unit, nine-tube chassis, preamp: 5 X 12AX7, power: 4 X 6L6GC or 2 X 6L6GC and 2 X EL34, three switchable channels (Clean Rhythm, Crunch Rhythm, Lead), reverb, front black control panel, single input,...
- similar to the MK-IIC/MK-IIC+, except in head-unit configuration, mfg. 1983-85.
