What tubes does the Vox AC50 use?

The Vox AC50 uses 1× 12AU7, 2× 12AX7 preamp tubes and 2× EL34 power tubes.

Who famously used the Vox AC50?

The Beatles are among the notable players associated with the Vox AC50.

What recordings feature the Vox AC50?

A Hard Day's Night by The Beatles (1964).

Vox AC50 preset

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

The AC50 is Vox's 50-watt head, introduced when the AC30 was no longer loud enough for bigger shows. This drawing is a single-channel circuit: two inputs into a 12AU7 stage and Volume, a 12AX7 gain stage and cathode follower into Treble and Bass, and a 12AX7 long-tailed-pair inverter. Unlike the AC30's cathode-biased EL84s, two fixed-bias EL34s run Class AB from a GZ34 rectifier, giving more clean headroom. The Beatles used AC50s in 1964.

Introduced: 1963
Made in: UK
Wattage: 50W
Channels: 1
Preamp tubes: 1× 12AU7, 2× 12AX7
Power tubes: 2× EL34

Known for: The Beatles.

Heard on: A Hard Day's Night — The Beatles (1964).

Tags: british, vintage, el34, 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.