What tubes does the Gibson Ga25 use?

The Gibson Ga25 uses 3× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Gibson Ga25 produced?

The Gibson Ga25 was produced 1955–1963.

Gibson Ga25 preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Gibson GA-25 is a 25-watt combo amplifier from the mid-to-late 1950s, stepping up from the 6V6-based models to a 6L6 push-pull output stage for more headroom and a broader frequency response. The 6L6 complement gives the GA-25 a fuller, more expansive clean tone compared to the smaller GA-20, with extended bass response and increased presence. When driven into breakup, the 6L6 output stage produces a rich, harmonically complex crunch well suited to blues, rockabilly, and early rock and roll.

Years produced: 1955–1963
Made in: USA
Wattage: 25W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 2× 6L6

Tags: american, vintage, clean, crunch.

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.