Gibson GA-46 - Channel I preset

Verified · 89/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The GA-46 is a two-channel Gibson amplifier built as a separate preamp and power chassis joined by a cable. Each channel has a 12AX7 input stage, a 5879 pentode gain stage and its own volume, bass and treble controls. A 12AX7 splits phase and runs the tremolo oscillator (depth and frequency, footswitchable). A 6SN7 driver feeds a push-pull pair of 6550 output tubes, with a 6V6 voltage regulator and a GZ34 rectifier.

• Made in: USA
• Wattage: 60W
• Channels: 2
• Preamp tubes: 3× 12AX7, 2× 5879, 1× 6SN7
• Power tubes: 2× 6550

Tags: american, vintage, clean, tremolo, 6550.

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.