Fender Bassman 59 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 1959 Fender Bassman is the most historically significant amplifier Fender ever produced. Its 5F6-A circuit — two channels, cathode-follower tone stack, four inputs, two 6L6 output tubes, and GZ34 rectifier — delivered warm, spongy clean tones that broke into rich harmonic crunch when pushed. Jim Marshall and Ken Bran used this exact circuit as the blueprint for the first Marshall amplifier, making it the grandfather of British rock. Buddy Guy, Muddy Waters, and countless Chicago blues legends played through Bassmans, and boutique builders still clone it today.

Known for: Buddy Guy, Muddy Waters, Jimmie Vaughan, Eric Clapton.

Heard on: Stone Crazy — Buddy Guy (1961).

Tags: american, vintage, clean, crunch.

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.