Vox AC50 Power Amp - Main preset

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

The AC50 power amp uses four EL34 tubes to deliver 50 watts of British power. The AC50 was used by The Beatles on their world tours in 1965–1966, giving it significant historical importance. This schematic covers the power amplifier stage.

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

Known for: The Beatles, 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.