Guild Quantum Bass - Normal preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Guild Quantum Bass is a late-1960s tube bass amp rated at 100 watts. It has two channels (Normal and Bass), each with two inputs and its own volume, treble and bass controls, plus a master volume. A 7025/12AX7 preamp and 7247 driver feed a pair of 8417 output tubes, with a 6GF7 regulating the screen and bias supply.

• Made in: USA
• Wattage: 100W
• Channels: 2
• Preamp tubes: 3× 12AX7, 1× 7247
• Power tubes: 2× 8417

Tags: american, vintage, bass, two-channel, high-wattage.

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.