Univox U-45B preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The U-45B is a small Univox tube amp built around 6BM8 triode-pentodes. The triode sections handle gain and cathodyne phase splitting, the pentode sections run push-pull for about 10 watts, and a 6X4 rectifier supplies power. It has a single volume and tone control and bias tremolo with a footswitch.

• Made in: Japan
• Wattage: 10W
• Channels: 1
• Preamp tubes: 1× 12AX7
• Power tubes: 2× 6BM8

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.