Ampeg Jet J-12B preset

verified · 89/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Ampeg Jet J-12-B (6V6 version) is a compact single-channel guitar combo. Two inputs feed half a 6SL7, then Volume and Tone controls; the other half of that 6SL7 is the tremolo oscillator, with a Speed control and a footswitch. A second 6SL7 works as a gain stage and self-balancing paraphase inverter driving a cathode-biased pair of 6V6s into an 8-ohm speaker, with negative feedback and a 5Y3GT rectifier.

Tags: american, vintage, 6v6, tremolo, low-wattage.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.