Univox U-1086 preset

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

The U-1086 is a Univox valve PA head of 1971, built by Unicord, not a solid-state amp. Four channels, each with two inputs, a 12AX7 triode stage and its own volume, mix into a 12AX7 stage feeding shared treble, middle and bass controls and a master, with an aux input. A 12AX7 and 12AU7 drive a spring reverb with level control and footswitch. A 12AU7 phase inverter with presence drives four fixed-bias 6L6GCs at about 650 V into four speaker jacks.

Tags: japanese, vintage, 6l6, reverb, high-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.