Ampeg G-115 preset

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

This Ampeg G-115 is a 175-watt solid-state guitar combo from 1978 with a single 15-inch speaker, aimed at pedal steel and lead guitar. Two inputs feed an op-amp preamp with volume, bass, treble, presence and a midrange control with a sweepable mid frequency, then sensitivity, spring reverb, and tremolo with speed and intensity on a double footswitch. Its power amp carries Ampeg's pentode simulator, an analog function generator meant to make the transistors respond like tubes.

Tags: american, solid-state, reverb, tremolo, high-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.