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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, 5 X 7 in. special oval type speaker (1954-56) or 1-8 in. round speaker (1957), three-tube chassis: preamp: 1 X 6SJ7, power: 1 X 6V6, rectifier: 5Y3, single channel, rear control panel, two inputs, single volume knob, earlier models ha...
- 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...
- 15W, 1-12 in. speaker, guitar combo, seven-tube chassis, preamp: 3 X 6EU7, 1 X 7199, power: 2 X 6V6, rectifier: 5Y3, two channels, tremolo, reverb, top silver control panel, two inputs, five black knobs (v, tone, depth, freq, r), footswit...
- 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...
- 12W, 1-12 in. Jensen speaker, guitar/microphone combo, five-tube chassis: preamp: 1 X 12AX7, 1 X 6SL7, power: 2 X 6V6, rectifier: 5Y3, two channels, top control panel, four inputs (three instrument, one mic), three black chicken head knob...
- 12.5W, 1-12 in. speaker, guitar combo, eight-tube chassis, preamp: 3 X 6EU7, 2 X 12AU7, power: 2 X EL84, rectifier: 5Y3, two channels, reverb, tremolo, white front control panel, four inputs (two per channel), 10 knobs (Ch. 1: v, t, b, Ch...
- 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-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.
