What tubes does the Gibson GA-75 (Later) - Channel 1 use?

The Gibson GA-75 (Later) - Channel 1 uses 3× 12AX7 preamp tubes and 4× 6L6 power tubes.

When was the Gibson GA-75 (Later) - Channel 1 produced?

The Gibson GA-75 (Later) - Channel 1 was produced 1955–1963.

Gibson GA-75 (Later) - Channel 1 preset

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

The Gibson GA-75 (later version) was one of Gibson's high-powered professional amps from the late 1950s, capable of delivering substantial clean volume on large stages. Its later circuit revisions improved reliability and tonal consistency over the earlier version.

Years produced: 1955–1963
Made in: US
Wattage: 30W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 4× 6L6

Tags: american, vintage, 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.