What tubes does the Gibson Ga 18T use?

The Gibson Ga 18T uses 2× 12AX7 preamp tubes and 2× 6V6 power tubes.

When was the Gibson Ga 18T produced?

The Gibson Ga 18T was produced 1960–1965.

Gibson Ga 18T preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The GA-18T is an 18-watt combo with tube-driven tremolo from Gibson's early 1960s range. Two 6V6 output tubes provide warm, balanced clean tones that push naturally into light crunch at higher volumes. The tremolo circuit delivers a smooth, hypnotic pulse suited to country and surf styles of the era. As a mid-size combo with built-in effects, the GA-18T was a practical gigging amp that balances portability with enough volume for small to medium venues.

Years produced: 1960–1965
Made in: USA
Wattage: 18W
Channels: 2
Preamp tubes: 2× 12AX7
Power tubes: 2× 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.