What tubes does the Gibson Ga 83S Stereo Vib Pwr Amp use?

The Gibson Ga 83S Stereo Vib Pwr Amp uses 4× 12AX7 preamp tubes and 4× 6L6 power tubes.

When was the Gibson Ga 83S Stereo Vib Pwr Amp produced?

The Gibson Ga 83S Stereo Vib Pwr Amp was produced 1959–1963.

Gibson Ga 83S Stereo Vib Pwr Amp preset

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

This schematic specifically covers the vibrato/power amplifier section of the Gibson GA-83S Stereo, documenting the tremolo modulation circuit and the dual power amplifier stages that drive the stereo speaker configuration. The vibrato circuit uses a dedicated tube oscillator to modulate amplitude across the stereo field, creating a unique, spatial tremolo effect unlike mono tremolo circuits. Studying this section is essential for servicing or modifying this landmark stereo amplifier.

Years produced: 1959–1963
Made in: USA
Wattage: 40W
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.