Vox AC1/AC15 (1958) - Vib/Trem preset

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

The 1958 Amplifier Model AC1 is one of the earliest Vox amplifiers, the forerunner of the AC15 built by Jennings before the AC30 appeared. Two inputs feed one half of a 12AX7 with its own volume; the other half, with a second volume, takes the return from the separately drawn Vibravox vibrato unit. A 12AX7 phase inverter with a Tone control drives two cathode-biased EL84s, on a 5Z4 rectifier with a choke-filtered supply.

• Introduced: 1958
• Made in: UK
• Wattage: 15W
• Channels: 2
• Preamp tubes: 2× 12AX7
• Power tubes: 2× EL84

Tags: british, vintage, el84, chime, low-wattage, two-channel.

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.