Rob Robinette 5F6-A Bassman Micro EF80 preset

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

Rob Robinette's 5F6-A Bassman Micro EF80 shrinks the tweed Bassman circuit, full tone stack and long-tail-pair inverter included, to about 5 watts. A push-pull pair of EF80 pentodes replaces the 6L6s. It runs on an EZ81 rectifier and a small Hammond output transformer.

• Made in: USA
• Wattage: 5W
• Channels: 1
• Preamp tubes: 1× 12AY7, 2× 12AX7
• Power tubes: 2× EF80

Tags: american, diy, tweed, breakup, low-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.