Univox U-155R preset

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

The U-155R is a small Univox tube combo with reverb. A 6AU6 pentode input stage and 12AX7 stages drive a pair of 6AQ5s, with a 6CA4 rectifier and a 6AV6 reverb recovery stage. It has volume and tone controls and three inputs.

• Made in: Japan
• Wattage: 12W
• Channels: 1
• Preamp tubes: 2× 12AX7, 1× 6AU6, 1× 6AV6, 1× 6AN8
• Power tubes: 2× 6AQ5

Tags: japanese, vintage, reverb.

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.