Gibson GA-25RVT - Normal preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The GA-25RVT is a two-channel Gibson combo dated October 1963, two inputs per channel and a volume on each, followed by one shared tone control. Four 6EU7s handle the preamps, tone stage, spring-reverb recovery and the tremolo oscillator (depth and frequency); a 12AU7 drives the reverb tank and splits phase for a cathode-biased push-pull pair of 6V6GT tubes on a 5Y3GT rectifier. Reverb has an on/off switch, and there is a monitor jack.

Tags: american, vintage, clean, reverb, tremolo, two-channel.

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.