Ampeg Reverbojet J-12R preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Ampeg Reverbojet J-12-R is a compact single-channel tube guitar combo of the late 1960s. Bright and normal inputs feed half a 12AX7, then a volume and a single tone control. A 6U10 compactron drives and recovers the reverb unit, with a Dimension control and footswitch, while the other half of the 12AX7 runs a photocell tremolo with speed. A second 12AX7 is the driver and phase inverter for a push-pull pair of 7591s on a solid-state bridge rectifier.

• Made in: USA
• Wattage: 18W
• Channels: 1
• Preamp tubes: 2× 12AX7, 1× 6U10
• Power tubes: 2× 7591

Tags: american, vintage, reverb, tremolo, mid-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.