Lesmann 500-P - Channel 1 preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Lesmann 500-P is a 1966 amplifier from the Lesmann Corporation of West Allis, Wisconsin, built to accompany its Accordio-Organ, an accordion with electronic organ voices. It is not a guitar amp. Two inputs have their own volume and tone, plus an organ pedal control. Four 7025s and a 12AU7 inverter drive two 6L6s from a 5U4 rectifier, with a tremolo/relay section, making it a common candidate for guitar conversion.

• Made in: USA
• Channels: 2
• Preamp tubes: 4× 7025, 1× 12AU7
• Power tubes: 2× 6L6

Tags: vintage, 6l6, 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.