Fender Bassman 6G6-B - Normal preset

Verified · 93/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 6G6-B is an early-1960s revision of the piggyback Bassman head. Bass and Normal channels each have two inputs and their own bass, treble and volume controls, and a presence control sits in the feedback loop. Four 7025s handle the preamp and long-tail phase inverter, driving two fixed-bias 5881s from a silicon diode rectifier, for firm, clean tone that breaks up at volume.

• Years produced: 1962–1964
• Made in: USA
• Wattage: 50W
• Channels: 2
• Preamp tubes: 4× 7025
• Power tubes: 2× 5881

Known for: Brian Setzer.

Heard on: Cat Fight (Over A Dog Like Me) — Stray Cats (2019).

Tags: american, vintage, brownface, bass, 6l6, clean.

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.