Leslie 50C (C2C Preamp) - Strings preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Leslie 50C is a dual power amplifier for Conn organs, used with the C2C preamp. It is an organ amp, not a guitar amp. It has two separately-volumed sections: the Flutes section runs a 12AU7 into a pair of 6550s, the Strings section runs a 12AU7 into a pair of 6V6s, and a 5U4GB rectifier powers both. The C2C preamp uses 12AT7 tubes.

• Made in: USA
• Channels: 2
• Preamp tubes: 2× 12AU7
• Power tubes: 2× 6550, 2× 6V6

Tags: american, vintage, 6550, 6v6, two-channel, 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.