Ampeg Jet J-12 (1961) preset

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

This is the early version of the Ampeg Jet J-12, drawn in July 1961, with a pair of 6SL7 octal preamp tubes, two 6V6 output tubes and a 5Y3 rectifier. It is a simple one-channel combo with volume, tone and tremolo, and it differs from the later Jet built around 7591 output tubes and 12AX7 preamp tubes. Its octal preamp and 6V6 output give a warm, round clean tone that breaks up early at higher volume.

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.