Leslie 125 / 225 Amplifier preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The amplifier for the Leslie 125 and 225 drives a rotary speaker cabinet for organs. It is an organ amp, not a guitar amp. A 12AU7A cathode-coupled phase inverter drives a pair of 6L6GC tubes from a solid-state bridge supply, and a relay switches the rotor speed. The 125 is a common, compact Leslie model that guitarists also play through for rotary-speaker sounds.

• Made in: USA
• Channels: 1
• Preamp tubes: 1× 12AU7A
• Power tubes: 2× 6L6GC

Tags: american, vintage, 6l6, clean.

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.