Gibson GA-8T Discoverer preset

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

The GA-8T Discoverer is a small single-channel Gibson combo with two inputs, volume and tone controls, and tremolo with depth, frequency and a footswitch. Both halves of a 12AX7 provide the gain; the triode of one 6BM8 works as a split-load phase inverter and the triode of the other runs the tremolo oscillator, while the two pentode sections form a cathode-biased push-pull output stage on a 5Y3 rectifier.

Tags: american, vintage, clean, tremolo, low-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.