Vox UL705 preset

Verified · 89/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The UL705 is a small JMI Vox valve combo with a single-ended, cathode-biased EL84 in Class A and an EZ80 rectifier, driving an 8-inch Celestion. Two inputs feed a 12AX7 stage, a Treble and Bass tone stack (not the Top Boost circuit) and a Volume, then a second triode that drives the EL84. A second 12AX7 is a phase-shift oscillator for tremolo, with Speed and Depth controls and an on/off footswitch.

• Made in: UK
• Channels: 1
• Preamp tubes: 2× 12AX7
• Power tubes: 1× EL84

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