Gibson GA-90 High Fidelity - Channel 2 preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The GA-90 High Fidelity is an early-1950s Gibson amp built on two chassis. The preamp has 5879 channel stages and a 12AU7 mixer with volume and tone per channel; the power amp uses 6SN7 drivers and a push-pull pair of 6L6GA tubes. It drives six 8-inch speakers.

• Made in: USA
• Wattage: 25W
• Channels: 2
• Preamp tubes: 2× 5879, 1× 12AU7, 2× 6SN7
• Power tubes: 2× 6L6GA

Tags: american, vintage, clean, 6l6.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.