Fender Bassman 5F6 A Lo preset

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

The Bassman 5F6-A Lo is an alternate layout document for the landmark 5F6-A Bassman circuit — the most celebrated tweed Fender design and direct inspiration for the Marshall JTM45.

• Years produced: 1958–1960
• Made in: USA
• Wattage: 45W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 4× 6L6

Known for: Buddy Holly, Jimmie Vaughan.

Tags: american, tweed, vintage, breakup, influential.

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.