Gibson Lespaul Preamp preset

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

The Gibson Les Paul Preamp schematic documents the preamplifier section of the Les Paul-branded GA-40 amplifier, the flagship Gibson amp of the early 1950s. The preamp circuit uses multiple 12AX7 triode stages for gain and tone shaping before the signal reaches the 6L6 output stage. Understanding this preamp topology reveals how Gibson achieved the warm, full-bodied clean tones that made the Les Paul amp a companion piece to the iconic guitar of the same name.

• Years produced: 1952–1956
• Made in: USA
• Wattage: 14W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 2× 6L6

Known for: Les Paul.

Tags: american, clean, vintage.

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.