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- 14W (1955-57) or 16W (1958-1960), 1-12 in. Jensen speaker, guitar/microphone combo, seven-tube chassis, preamp: 2 X 5879, 1 X 7025, 1 X 6SQ7, power: 2 X 6V6, rectifier: 5Y3, two channels, tremolo, top rear-mounted control panel, four inputs (two per channel), five black chicken head knobs (Ch. 1 v, Ch. 2 v, tone tremolo depth, tremolo freq.), available in two-tone Buffalo grain covering with a woven Saran grille and "Gibson 40" logo centered above the grille (1955-56), two-tone Buffalo grain covering with a woven Saran grille and "Gibson" logo centered above the grille (1957-59), or tweed covering with a dark brown grille cloth (1960), 22 in. wide, 20 in. tall, 10.125 in. deep, 4,275 shipped, mfg. 1955-1960.
In 1956, the chassis was upgraded to eight tubes (tubes unknown). In 1958, the design changed to a two-tone brown, only a "Gibson" logo above the grille, and a metal handle with a plastic middle replaced the leather one. Shipping totals reflect the total number shipped from the start of 1955 (regardless if first version models were still shipped into 1955).
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- Wattage unknown, 2-10 in. speakers, guitar combo, nine-tube chassis, preamp: 4 X 6EU7, 1 X 12AU7, 1 X 6CG7, power: 2 X 6L6, rectifier: 0A2, three diodes, two channels, reverb, tremolo, front white control panel, four inputs (two per chann...
- 15W, 1-12 in. Jensen P12R and 1-8 in. speakers, guitar combo, six-tube chassis, preamp: 1 X 6SJ7, 2 X 6J5, power: 2 X 6V6GT, rectifier: 5Y3, single channel, bottom rear-mounted control panel, four inputs (three inst., one mic), two knobs...
- similar to the GA-50, except has a tremolo circuit with an eight-tube chassis, preamp: 3 X 6SJ7, 1 X 6SN7, 1 X 6SL7, power: 2 X 6L6, rectifier: 5V4, and six knobs (Ch. 1 v, Ch. 2 v, b, t, s, i), 1,717 shipped, mfg. 1948-1955.
- 14W, 1-12 in. Jensen P12R and 1-8 in. Jensen speakers, guitar combo, six-tube chassis, preamp: 1 X 6SC7, 2 X 6SJ7, power: 2 X 6V6, rectifier: 5Y3, two channels, rear bottom control panel (1949-1954) or rear top control panel (1954-1961),...
- similar to the GA-30 Invader, except has a reverb circuit with a seven-tube chassis, preamp: 3 X 6EU7, 1 X 12AU7, power: 2 X 6V6 power, rectifier: 5Y3, top mounted silver control panel, four inputs (two per channel), four black and silver...
- 25W, 1-12 in. speaker, guitar combo, six-tube chassis, 1962-63 preamp: 3 X 6EU7, 1 X 12AU7, power: 2 X 7591, rectifier: GZ34, 1964-67 preamp: 3 X 6EU7, 1 X 6C4, power: 2 X 7591, rectifier: GZ34, two channels, tremolo, top/front silver con...
- 35W, 1-12 in. speaker, guitar combo, eight-tube chassis, preamp: 2 X 6EU7, 12AX7, 2 X 12AU7, power: 2 X 7591, rectifer: 0A2, two channels, tremolo, reverb, front white control panel, four inputs (two per channel), 10 knobs (Ch.1: v, t, b,...
- 14W, 1-12 in. Jensen speaker, guitar combo, eight-tube chassis, preamp: 3 X 6SJ7, 1 X 6SN7, 1 X 6V6, power: 2 X 6V6, rectifier: 5V4, two channels, tremolo, top rear-mounted black control panel, four inputs (three inst., one mic), four bla...
