What tubes does the Gibson GA-77RET - Channel 2 use?

The Gibson GA-77RET - Channel 2 uses 3× 12AX7 preamp tubes and 4× 6L6 power tubes.

When was the Gibson GA-77RET - Channel 2 produced?

The Gibson GA-77RET - Channel 2 was produced 1960–1967.

Gibson GA-77RET - Channel 2 preset

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

The Gibson GA-77RET was a professional reverb amp with electronic tremolo, adding sophisticated onboard effects to one of Gibson's most powerful combos. It was aimed at professional guitarists who needed maximum volume and onboard effects in a single unit.

Years produced: 1960–1967
Made in: US
Wattage: 35W
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.