No. of Channels
Two-Channel
Amp Type
Tube
Inputs
Four inputs (three inst., one mic 1954-56, two per channel 1957-1961)
Outputs
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- 16W, 1-12 in. Jensen Concert Series speaker, guitar combo, five-tube chassis, preamp: 2 X 12AX7, output: 2 X 6V6, rectifier: 5Y3, two channels, top rear control panel, four inputs (three inst., one mic 1954-56, two per channel 1957-1961), three controls (inst. v, mic v, tone), available in two-tone Buffalo grain covering with a woven Saran grille and "Gibson 20" 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, 4,271 shipped, mfg. 1954-1961.
In 1954, Gibson introduced the second version of the GA-20 and changed to a two-tone brown covering with a rectangle brown speaker grille, the logo "Gibson 20" moved above the grille, and dimensions of 20 in. wide, 16 in. tall, 8.625 in. deep, and 24 lbs. In 1958, the cabinet was changed slightly to a different two-tone brown covering, only the "Gibson" logo appeared on the front, and the dimensions changed to 20 in. wide, 16 in. tall, 9 in. deep, and 24 lbs. In 1960, the name Crest was added to GA-20 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, 1-10 in. speaker, six-tube chassis, preamp: 2 X 6EU7, 1 X 12AX7, power: 2 X 6AQ5, rectifier: 6CA4, single channel, tremolo, reverb, top silver control panel, two inputs, four black and silver knobs (v, r, tremolo freq., p...
- similar to the GA-20/GA-20 Crest Second Version, except has a tremolo circuit with a seven-tube chassis, preamp: 1 X 12AY7, 1 X 7025, 1 X 5879, 1 X 6SQ7, power: 2 X 6V6, rectifier: 5Y3, five knobs (tone, s, v1, i, v2), available in two-to...
- 10W, 1-8 in. (1954-56) or 1-10 in. Jensen (1956-59) speaker, four-tube chassis: preamp: 6SJ7, power: 2 X 6V6, rectifier: 5Y3, single channel, top-mounted chrome control panel, two inst. inputs, two knobs (v, tone), available in light brow...
- similar to the GA-8 Discoverer, except has built-in tremolo, five-tube chassis, preamp: 2 X 6EU7, power: 2 X 6BQ5, rectifier: 6CA4, four knobs (v, tone, s, i, 1960-62) or five knobs (v, t, b, s, i), available in tweed covering with a full...
- similar to the GA-5 Skylark except has built-in tremolo, five tube chassis, preamp: 2 X 6EU7, power: 6AQ7, rectifier: 6X4, and controls for tremolo speed and intensity, 4,464 shipped, mfg. 1960-62.
- 14W, 1-10 in. Jensen speaker, guitar/microphone combo, five-tube chassis, preamp: 2 X 12AX7, power: 2 X 6V6, rectifier: 5Y3, two channels, top control panel, four inputs (two per channel), three control knobs (v1, v2, tone), tweed coverin...
- similar to the GA-5 Skylark (Second Version) except has built in tremolo, five-tube chassis, preamp: 2 X 6EU7, power: 6AQ7, rectifier: 6X4, and controls for tremolo speed and intensity, 10,315 shipped, mfg. 1963-65.
- similar to the GA-5 Skylark (Third Version) except has built in-tremolo, a four-tube chassis, preamp: 2 X 6EU7, power: 6AQ7, rectifier: 6X4, and six knobs (v, t, b, depth, freq., power), 4,993 shipped, mfg. 1966-67.
