Univox U-75 preset

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

The U-75 is a small Univox tube combo: 12AX7 gain stages, a cathodyne phase inverter and a pair of cathode-biased 6AQ5s for about 10 watts, with a 6X4 rectifier. It has volume and tone controls, Guitar, Accordion and Mic inputs, and tremolo with a footswitch.

• Made in: Japan
• Wattage: 10W
• Channels: 1
• Preamp tubes: 2× 12AX7
• Power tubes: 2× 6AQ5

Tags: japanese, vintage, 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.