What tubes does the Gibson GA-100 Bass Amp - Normal use?

The Gibson GA-100 Bass Amp - Normal uses 4× 12AX7 preamp tubes and 4× 6L6 power tubes.

When was the Gibson GA-100 Bass Amp - Normal produced?

The Gibson GA-100 Bass Amp - Normal was produced 1959–1967.

Gibson GA-100 Bass Amp - Normal preset

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

The Gibson GA-100 is the most powerful amplifier in the GA series, delivering 100 watts through four 6L6 output tubes. Designed for large venue performance and professional touring use in the late 1950s and 1960s, the GA-100 provides tremendous clean headroom with the broad, authoritative American tone characteristic of high-powered 6L6 amplification. When pushed, the four-tube output section produces a rich, complex crunch. The GA-100 represents the peak of Gibson's tube amplifier engineering during the golden era of American amp manufacturing.

Years produced: 1959–1967
Made in: USA
Wattage: 100W
Channels: 2
Preamp tubes: 4× 12AX7
Power tubes: 4× 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.