Fender Bassman 5F6-A - Bright preset

Verified · 94/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 5F6-A is the late-1950s tweed Bassman, a 4×10 combo whose circuit became the template for the Marshall JTM45. A 12AY7 input stage, a 12AX7 gain stage and cathode follower driving a treble/bass/mid stack, and a 12AX7 long-tail phase inverter feed two fixed-bias 5881s on a GZ34 rectifier. Built for bass, it became a classic guitar amp for its full clean tone and rich overdrive when cranked.

• Years produced: 1958–1960
• Made in: USA
• Wattage: 45W
• Channels: 2
• Preamp tubes: 1× 12AY7, 2× 12AX7
• Power tubes: 2× 5881

Known for: Buddy Guy, Bruce Springsteen, Stevie Ray Vaughan, Jimmie Vaughan.

Heard on: Damn Right, I've Got the Blues — Buddy Guy (1991).

Tags: american, tweed, vintage, breakup, 6l6, two-channel.

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.