What tubes does the Gibson GA-78 (stereo) - Channel 1 use?

The Gibson GA-78 (stereo) - Channel 1 uses 3× 12AX7 preamp tubes and 4× 6L6 power tubes.

When was the Gibson GA-78 (stereo) - Channel 1 produced?

The Gibson GA-78 (stereo) - Channel 1 was produced 1959–1963.

Gibson GA-78 (stereo) - Channel 1 preset

Close · 76/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Gibson GA-78 is a high-powered 1960s combo featuring four 6L6 output tubes for approximately 40 watts of clean American tone. Designed for professional stage use, it delivers bold, authoritative sound with ample headroom across a wide dynamic range. Two channels accommodate both clean rhythm and hotter lead inputs. The GA-78 is among the most powerful combos in the GA lineup and represents Gibson's answer to the growing demand for high-output amplification in live music settings.

Years produced: 1959–1963
Made in: USA
Wattage: 40W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 4× 6L6

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.