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- 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...
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- 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), four inputs (three inst., one mic), three knobs (tone, inst. v, mic v), tone expander switch, available in brown leatherette covering with a wide rectangular light brown grille cloth and centered "Gibson" logo (1949-1954), two-tone Buffalo grain covering with a woven Saran grille and "Gibson 30" logo centered above the grille (1954-56), 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 (1960-61), 5,996 shipped, mfg. 1948-1961.
Originally, the covering on this amp was a medium brown with a light brown rectangle grille cloth and a "Gibson" logo in the center. In 1956, the chassis was moved to to the top, the cabinet changed to a two-tone brown covering with a rectangle brown speaker grille, the logo "Gibson 30" was placed above the grille, and dimensions were 22 in. wide, 20 in. tall, 10.175 in. deep, and 32 lbs. In 1958, the cabinet was changed slightly to a different two-tone brown covering, only the "Gibson" logo appeared on the front, and a metal handle with plastic middle replaced the leather one. In 1960, the name Invader was added to GA-30, a standby pointer knob was added, and the cabinet changed again to a tweed covering with a brown grille and the "Gibson" logo in the upper right corner.
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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...
- 18W, 1-12 in and 1-8 in. Jensen speakers, seven-tube chassis, preamp: 2 X 6SJ7, 2 X 6J5, power: 2 X 6550, rectifier: 5AR4, two channels, bottom rear control panel, four inputs (three inst., one mic), four knobs (Ch. 1 v, Ch. 2 v, b, 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...
- 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,...
- approx. 15W, 1-15 in. speaker (early models) or 2-10 in. speakers (later models), guitar combo, eight-tube chassis, preamp: 4 X 6EU7, 1 X 12AU7, power: 2 X 6V6, rectifier: 5Y3, two channels, tremolo, reverb, top front control panel, four...
- 25W, 1-12 in. and 1-10 in. speakers, guitar combo, nine-tube chassis, preamp: 4 X 6EU7, 2 X 12AU7, power: 2 X 7591, rectifier: 0A2/5AR4, two channels, top silver control panel, four inputs (two per channel), eight black and silver knobs (...
- 25W, 1-12 in. Jensen speaker, guitar combo, seven-tube chassis, preamp: 3 X 6EU7, 1 X 12AU7, power: 2 X 7591, rectifier: 5AR4, two channels, tremolo, top silver control panel, four inputs (two per channel), five black and silver knobs (Ch...
- 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.
