Gibson Thor Bass preset

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

The Thor is a 1960s Gibson bass amplifier with a single channel: two inputs, then treble, bass and volume controls. One 6EU7 provides the input preamp and voltage amp, and a second 6EU7 works as a long-tail phase inverter with negative feedback from the speaker line. It drives a fixed-bias push-pull pair of 6CA7 (EL34) tubes on a silicon-diode rectifier with a choke-filtered supply, into two 10-inch speakers.

• Made in: USA
• Channels: 1
• Preamp tubes: 2× 6EU7
• Power tubes: 2× 6CA7

Tags: american, vintage, bass, el34.

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.