Gibson GA-77RV Vanguard - Reverb preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The GA-77RV Vanguard is a 1961 Gibson combo with reverb and a 15-inch speaker. Two inputs, each with its own volume, run through 6EU7 stages to the tone controls. A reverb tank is driven by a transformer, and a 12AU7 phase inverter feeds two 6L6GCs on a GZ34 rectifier. It is a reverb version of the GA-77 and has no tremolo.

• Made in: USA
• Channels: 2
• Preamp tubes: 3× 6EU7, 1× 12AU7
• Power tubes: 2× 6L6GC

Tags: american, vintage, reverb, 6l6, 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.