What tubes does the Gibson Les Paul GA-40 - Channel 1 use?

The Gibson Les Paul GA-40 - Channel 1 uses 2× 5879, 1× 12AX7, 1× 6SQ7 preamp tubes and 2× 6V6GT power tubes.

When was the Gibson Les Paul GA-40 - Channel 1 produced?

The Gibson Les Paul GA-40 - Channel 1 was produced 1952–1962.

Gibson Les Paul GA-40 - Channel 1 preset

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

The Les Paul GA-40 is the 1950s Gibson amp sold as the companion to the Les Paul guitar. Two channels, two inputs each, run on their own 5879 pentode with their own volume control; channel 2 passes through a multi-section RC network that the 6SQ7 tremolo modulates, with depth, frequency and a remote footswitch. A 12AX7 long-tail inverter drives a cathode-biased push-pull pair of 6V6GT tubes on a 5Y3GT rectifier for about 14 watts.

Years produced: 1952–1962
Made in: USA
Wattage: 14W
Channels: 2
Preamp tubes: 2× 5879, 1× 12AX7, 1× 6SQ7
Power tubes: 2× 6V6GT

Tags: american, vintage, clean, tremolo, 6v6.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.