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- 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-tone Buffalo grain covering with a woven Saran grille and "Gibson 20T" logo centered above the grille (1956 only), 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), 4,224 shipped, mfg. 1956-61.
Originally, this amp cabinet featured a two-tone brown covering with a rectangle brown speaker grille, the logo "Gibson 20T" 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 Ranger was added to GA-20T 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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- 4W, 1-10 in. speaker, guitar combo, three-tube chassis, preamp: 1 X 6SJ7, power: 1 X 6V6, rectifier: 5Y3, single channel, rear control panel, two inst. inputs, single volume knob, two-tone "oatmeal" buffalo grain covering, gold...
- 10W, 1-10 in. speaker, three tube chassis, preamp: 6EU7, power: 6BQ5, rectifier: 6X4, two diodes, single channel, front silver control panel, two inputs, four knobs (v, t, b, power), black alligator covering, gray grille, 17 in. wide, 14....
- 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),...
- 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...
- 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...
- 10W, 1-10 in. speaker, five tube chassis, preamp: 1 X 6EU7, 1 X 6C4, power: 2 X 6AQ5, rectifier: 6X4, single channel, front silver control panel, two inputs, two knobs (v, power switch), brown covering, brown grille, 19.5 in. wide, 15 in....
- 14W, 1-12 in. Jensen speaker, five-tube chassis: preamp: 2 X 12AX7, power: 2 X 6V6, rectifier: 5Y3, two channels, top control panel, four inputs (two per channel), three black chicken head knobs (tone, inst v, mic v), tweed covering, full...
- 12-14W, 1-12 in. Jensen speaker, six-tube chassis, preamp: 2 X 6SC7, 1 X 6SL7, output: 2 X 6V6, rectifier: 5Y3, two channels, top rear-mounted control panel, four inputs (three inst., one mic), three controls (inst. v, mic v, tone), brown...
