Gibson GA-1RVT preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The GA-1RVT is a small 1960s Gibson practice combo with two inputs, tone and volume controls, spring reverb and tremolo. The pentode half of a 7199 is the input stage and its triode drives the reverb tank, which half a 6EU7 recovers through a switched reverb level control. The other 6EU7 half drives a single-ended 6BM8 pentode with feedback from the speaker, and the 6BM8 triode runs the tremolo (rate control). 5Y3 rectifier, about 4 watts.

• Made in: USA
• Wattage: 4W
• Channels: 1
• Preamp tubes: 1× 7199, 1× 6EU7
• Power tubes: 1× 6BM8

Tags: american, vintage, reverb, tremolo, low-wattage, practice.

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.