What tubes does the Gibson Ga77 1954 use?

The Gibson Ga77 1954 uses 3× 12AX7 preamp tubes and 4× 6V6 power tubes.

When was the Gibson Ga77 1954 produced?

The Gibson Ga77 1954 was produced 1954–1957.

Gibson Ga77 1954 preset

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

The 1954 Gibson GA-77 is an early version of Gibson's premium professional combo from the mid-1950s, using four 6V6 output tubes to generate around 35 watts. Its two-speaker configuration and two-channel layout made it a practical tool for professional musicians of the era. The tone is warm, full, and characteristically American, with the naturally compressed feel of the 6V6 output stage pushed into its sweet spot. An important and collectible piece of 1950s American amplifier history.

Years produced: 1954–1957
Made in: USA
Wattage: 35W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 4× 6V6

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.