Ampeg Gemini VI GS-15-R preset

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

The Ampeg Gemini VI GS-15-R is a single-channel tube guitar combo with four inputs into one 12AX7 stage, a volume with an Ultra High switch, and bass and treble controls. A 6CG7 drives the built-in echo (reverb) unit, recovered by half a 12AX7 with an Echo Dimension control, and the other half of that 12AX7 runs tremolo through Ampeg's TM-1 module with speed and intensity. A 7199 phase inverter drives two fixed-bias 7591s off a solid-state rectifier.

• Made in: USA
• Wattage: 22W
• Channels: 1
• Preamp tubes: 2× 12AX7, 1× 6CG7, 1× 7199
• Power tubes: 2× 7591

Tags: american, vintage, reverb, tremolo, 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.