Ampeg Gemini 20 G-20 - Channel 2 preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 1969 Ampeg Gemini 20 G-20 is a two-channel tube guitar combo. Each channel has bright and normal inputs, volume, bass and treble controls and an Ultra High switch. A 6CG7 drives the echo (reverb) unit with a Dimension control and its own footswitch, and half a 12AX7 runs tremolo with speed, intensity and an After-Beat switch. A 7199 phase inverter feeds a pair of 6L6GCs off a silicon bridge rectifier, with an external-amp output.

• Made in: USA
• Wattage: 20W
• Channels: 2
• Preamp tubes: 3× 12AX7, 1× 6CG7, 1× 7199
• Power tubes: 2× 6L6GC

Tags: american, vintage, 6l6, tremolo, two-channel, mid-wattage.

Schematic-derived preset files for 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.