Univox Stage 720K preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Stage 720K is a solid-state Univox amp from 1977, built by Unicord. Four inputs each feed their own transistor preamp module with treble, bass and volume controls and a reverb send switch, mixing into a master volume and line out. A transistor-driven spring reverb has its own level control and footswitch. A quasi-complementary transistor power amp drives the internal speaker and an 8-ohm extension jack.

• Channels: 1

Tags: solid-state, 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.