Gibson GA-83S Stereo Vibrato - Channel I preset

Verified · 83/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Gibson GA-83S Stereo Vibrato was Gibson's most ambitious amp of the 1960s, offering true stereo operation with dual power sections and sophisticated vibrato effects. It targeted professional players who wanted maximum tonal breadth and stage presence in a single unit.

• Years produced: 1963–1968
• Made in: US
• Wattage: 35W
• Channels: 2
• Preamp tubes: 4× 12AX7
• Power tubes: 4× 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.