Ampeg AC-12 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Ampeg AC-12 is a single-channel tube combo with Instrument and Accordion inputs. A 12AX7 input stage feeds Intensity, Tone and Volume controls and a 6U10 compactron gain stage. Other 6U10 sections drive and recover a spring reverb set by a Dimension control, while a 12AX7 oscillator with Speed drives a photocell tremolo. A 12DW7 inverter feeds two cathode-biased 7591As off a solid-state rectifier, with a reverb/tremolo footswitch.

• Made in: USA
• Wattage: 22W
• Channels: 1
• Preamp tubes: 1× 12AX7, 1× 6U10, 1× 12DW7
• Power tubes: 2× 7591A

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.