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ELECTRIC TUBE AMPS: GEMINI SERIES

The Gemini Series was introduced in 1964 after a year in development and was named after the space program. It was Ampeg's first series of amps to have a front-mounted control panel and a horizontally-mounted chassis besides the Portaflex Series. Parts of the back panel on the Gemini amps could be removed to alter the sound and tone. The Gemini name was used on a variety of different amplifiers through the early 1970s.

Models (8)

G-12 GEMINI I

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- 22W, 1-12 in. speaker, guitar/accordion combo, seven-tube chassis, preamp: 3 X 6SL7/12AX7, 1 X 6SN7, 1 X 7199, power: 2 X 7591A, solid-state rectifier, two channels, reverb, tremolo, front chrome control panel, four inputs (two per channel with one each for accordion and one for guitar), nine black knobs (Ch. 1: s, i, v, t, b, echo, Ch. 2: v, t, b), two-button footswitch, available in Blue Check covering with a gray grille, mfg. 1964-68.
The treble control had a click stop feature that acted as a bright switch when clicked past. Reverb was only available on the first channel, but models have been observed between 1966-67 with another reverb control for the second channel on the back of the amp - it is likely that this was a non-cataloged factory option. This model was also available with a Lansing speaker and called the G-12L.
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G-15 GEMINI II

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- 30W, 1-15 in. speaker, guitar/accordion combo, seven-tube chassis, preamp: 3 X 6SL7/12AX7, 1 X 6SN7, 1 X 7868, power: 2 X 7591A, solid-state rectifier, two channels, reverb, tremolo, front chrome control panel, four inputs (two per channel with one each for accordion and one for guitar), nine black knobs (Ch. 1: s, i, v, t, b, echo, Ch. 2: v, t, b), two-button footswitch, available in Blue Check covering with a gray grille, mfg. 1965-68.
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G-20 GEMINI 20

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- 35W, 2-10 in. speakers, guitar combo, eight-tube chassis: preamp: 4 X 12AX7, 1 X 6CG7, 1 X 7199, power: 2 X 6L6GC, solid-state rectifier, two channels, reverb, tremolo, silver front control panel, four inputs (two per channel, one each for normal and bright), nine black knobs (Ch. 1: v, t, b, r, tremolo speed, afterbeat, Ch. 2: v, t, b), ultra high and ultra low switches for each channel, black covering, blue/gray grille, mfg. 1969-1972.
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GS-15R GEMINI VI

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- 22W, 1-12 in. speaker, accordion combo, six-tube chassis, preamp: 2 X 12AX7, 1 X 6CG7, 1 X 7199, power: 2 X 7591A, solid-state rectifier, single channel, reverb, tremolo, front chrome control panel, four inputs (guitar, accordion, aux., mic.), six black knobs (v, t, b, r, s, i), two-button footswitch, available in Blue Check covering with a gray grille, mfg. 1966-67.
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GV-15 GEMINI V (FIRST VERSION)

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- 30W, 1-15 in. speaker, guitar/accordion combo, seven-tube chassis, preamp: 3 X 6SL7/12AX7, 1 X 6SN7, 1 X 7868, power: 2 X 7591A, solid-state rectifier, two channels, reverb, tremolo, vibrato, front chrome control panel, four inputs (two per channel), nine black knobs (Ch. 1: tremolo, vibrato, v, t, b, echo, Ch. 2: v, t, b), two-button footswitch, available in Blue Check covering with a gray grille, mfg. 1967 only.
Later in 1968, the Gemini V changed to a printed circuit board, ultra high and lo controls, output was raised to 35W, and an Altec 418B speaker available as an option.
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GV-15 GEMINI V (SECOND VERSION)

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- 35W, 1-15 in. speaker, guitar/accordion combo, seven-tube chassis, preamp: 3 X 6SL7/12AX7, 1 X 6SN7, 1 X 7868, power: 2 X 7591A, solid-state rectifier, printed circuit board, two channels, reverb, tremolo, vibrato, front chrome control panel, four inputs (two per channel), nine black knobs (Ch. 1: tremolo, vibrato, v, t, b, echo, Ch. 2: v, t, b), ultra high and ultra low switches for each channel, two-button footswitch, available in black vinyl covering with a gray grille, mfg. 1968-1972.
This model had an optional Altec 418B speaker.
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GV-22 GEMINI 22

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- 35W, 2-12 in. speakers, guitar combo, eight-tube chassis: preamp: 4 X 12AX7, 1 X 6CG7, 1 X 7199, power: 2 X 6L6GC, solid-state rectifier, two channels, reverb, tremolo, vibrato, silver front control panel, four inputs (two per channel, one each for normal and bright), nine black knobs (Ch. 1: v, t, b, Ch. 2: v, t, b, r, s, i), ultra high and ultra low switches for each channel, black covering, blue/gray grille, mfg. 1969-1972.
The GV-22 Gemini 22 utilized the chassis from the GV-15 Gemini 15. Altec speakers were optional.
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GEMINI 12

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- 22W, 1-12 in. speaker, guitar/accordion combo, seven-tube chassis, preamp: 3 X 6SL7/12AX7, 1 X 6SN7, 1 X 7199, power: 2 X 7591A, solid-state rectifier, two channels, reverb, tremolo, front chrome control panel, four inputs (two per channel), nine black knobs (Ch. 1: s, i, v, t, b, echo, Ch. 2: v, t, b), ultra hi switch, ultra low switch, two-button footswitch, available in black vinyl covering with a gray grille, mfg. 1968-1971.
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