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- 60 or 100W, 1-12 in. speaker, guitar combo, eight-tube chassis, preamp: 4 X 12AX7, power: 4 X 6L6GC, two channels, optional reverb, front black control panel, two inputs, six black knobs (v1, v2, MV, t, b, m), optional five-band graphic EQ (later models), standy switch, power switch, rear panel: ground switch, slave out jack with level control, optional presence control, optional reverb control, speaker jacks, available in a wood cabinet with a wicker cane grille or white Tolex with a brown grille, includes serial numbers 1-2999, mfg. 1971-78.
These early Boogies are referred to as "Mark I" but this nomencalture isn't stamped anywhere on the amp and it wasn't called this until the Mark II was introduced in 1978. The Mark I has two channels, but they are not switchable - the cable must be plugged into one or the other inputs. Later models have a push/pull bright switch on the 1st volume knob and a push/pull boost switch on the 2nd volume knob. Reverb was optional and this did not become very common until later on. The five-band graphic EQ was introduced as an option later on as well. The rear control panel is very primitive with Dymo stick labeling the various controls and jacks.
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- 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.
- similar to the MK-IIB, except in head-unit configuration, mfg. 1983-1985.
- 100W, 1-12 in. Celestion Custom 90 speaker, guitar combo, nine-tube Class A/B chassis, 4 X 12AX7, 1 X 12AT7, power: 4 X 6L6, two modes, reverb, front black control panel, two inputs, six black knobs (v1, v2, MV, t, b, m), half power switc...
- 35W (switchable to 25W/10W), guitar combo amp, 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 MK-1 Reissue except in head-unit configuration, mfg. 1989-2007.
- similar to the MK-IIA and MK-IIB, except has quieter channel switching and a quieter reverb circuit (MK-IIC) and a more sensitive lead channel and improved effects loop (MK-IIC+), serial numbers 11,001-14,999, mfg. 1983-85.
