Vox AC30 preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The AC30 is Vox's four-EL84 Class A combo, first built in 1958/59 when the Shadows needed more power than the AC15 offered. With no negative feedback, a Cut control and, from the early 1960s, the Top Boost circuit, it produces the chime, compression and bloom heard on countless British records. This page covers several variants that share the Normal, Top Boost and Vib/Trem layout.

• Years produced: 1959–present
• Made in: UK
• Wattage: 30W
• Channels: 3
• Preamp tubes: 5× ECC83, 1× ECC82
• Power tubes: 4× EL84

Known for: The Beatles, The Edge, Brian May, Hank Marvin, Rory Gallagher.

Heard on: Where the Streets Have No Name — U2 (1987); Bohemian Rhapsody — Queen (1975); Please Please Me — The Beatles (1963); Used To Be — Rory Gallagher (1971).

Tags: british, vintage, el84, chime, class-a, top-boost, tremolo, multi-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.