What tubes does the Gibson Ga 30 65J7 Preamp use?

The Gibson Ga 30 65J7 Preamp uses 1× 65J7 preamp tubes and 2× 6L6 power tubes.

When was the Gibson Ga 30 65J7 Preamp produced?

The Gibson Ga 30 65J7 Preamp was produced 1950–1955.

Gibson Ga 30 65J7 Preamp preset

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

The Gibson GA-30 with 6SJ7/65J7 preamp was an early 1950s version of Gibson's popular GA-30 combo, using older pentode preamp tubes before the transition to 12AX7s. It produced warm, rounded tones characteristic of early postwar American amp design.

Years produced: 1950–1955
Made in: US
Wattage: 14W
Channels: 2
Preamp tubes: 1× 65J7
Power tubes: 2× 6L6

Tags: american, vintage, clean.

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.