What tubes does the Gibson GA-88S - Channel B use?

The Gibson GA-88S - Channel B uses 4× 12AX7 preamp tubes and 4× 6L6 power tubes.

When was the Gibson GA-88S - Channel B produced?

The Gibson GA-88S - Channel B was produced 1962–1966.

Gibson GA-88S - Channel B preset

Close · 76/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Gibson GA-88S is an updated stereo combo descended from the GA-83S, continuing Gibson's commitment to stereo guitar amplification in the early 1960s. Four 6L6 output tubes across two channels deliver genuine stereo spread through multiple speakers. The GA-88S was an ambitious professional product aimed at players who wanted to exploit the spatial possibilities of stereo guitar. It remains one of the most distinctive and technically interesting amplifiers Gibson produced.

Years produced: 1962–1966
Made in: USA
Wattage: 50W
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.