What tubes does the Vox AC34 - Vib/Trem use?

The Vox AC34 - Vib/Trem uses 1× EF86, 3× 12AX7, 1× 12AU7 preamp tubes and 4× EL84 power tubes.

When was the Vox AC34 - Vib/Trem produced?

The Vox AC34 - Vib/Trem was produced 1960–1961.

Vox AC34 - Vib/Trem preset

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

The AC.34 is the name printed on JMI's April 1960 drawing of the AC30/4, the first AC30 Twin and in effect an AC15 circuit with four EL84s. The Normal channel runs an EF86 pentode with a Brilliance switch and its own Volume; the Vib/Trem channel uses a 12AX7 with its own Volume, a 12AX7 oscillator and 12AU7 modulator (Speed, Depth preset, footswitch). A Cut control sits at the 12AX7 long-tailed pair, on a GZ34 rectifier.

Years produced: 1960–1961
Made in: UK
Wattage: 30W
Channels: 2
Preamp tubes: 1× EF86, 3× 12AX7, 1× 12AU7
Power tubes: 4× EL84

Tags: british, vintage, el84, class-a, tremolo, 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.