What tubes does the Gibson GA-90 - Channel 1 use?

The Gibson GA-90 - Channel 1 uses 4× 12AX7 preamp tubes and 4× 6L6 power tubes.

When was the Gibson GA-90 - Channel 1 produced?

The Gibson GA-90 - Channel 1 was produced 1965–1968.

Gibson GA-90 - Channel 1 preset

Close · 78/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Gibson GA-90 is one of the most powerful amplifiers ever produced under the Gibson name, delivering approximately 90 watts through four 6L6 output tubes. Designed for large stage use in the mid-1960s, it provides massive clean headroom suited to the biggest venues of the era. Two channels and comprehensive tone controls give players full command over their sound. The GA-90 represents Gibson's bid for the top end of the professional amplifier market alongside Fender's Twin Reverb.

Years produced: 1965–1968
Made in: USA
Wattage: 90W
Channels: 2
Preamp tubes: 4× 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.