Univox U-152 - Channel 1 preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The U-152 is a Japanese-built Univox valve combo of the 1960s. Two channels, each with Bright and Normal inputs, a 12AX7 triode stage, its own volume and its own tone control, mix into a 12AX7 gain stage and phase inverter with negative feedback from the speaker. A pair of 6973 power pentodes shares a 300-ohm cathode resistor, fed from a 6CA4 valve rectifier. A third 12AX7 runs a phase-shift tremolo with speed, intensity and a footswitch.

• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 2× 6973

Tags: vintage, 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.