Vox Ac50 1 preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The AC50 Mark III is a 50-watt EL34-powered Vox amplifier used prominently by The Beatles on their world tours. It features a Normal channel and a treble-boost channel, delivering the larger, louder voice needed for touring. A historically significant amp in rock history.

• Years produced: 1964–1967
• Made in: UK
• Wattage: 50W
• Channels: 2
• Preamp tubes: 3× ECC83
• Power tubes: 4× EL34

Known for: The Beatles, John Lennon, Paul McCartney.

Tags: british, el34, vintage, historic.

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.