What tubes does the Fender Bassman Aa371 use?

The Fender Bassman Aa371 uses 3× 12AX7, 1× 12AT7 preamp tubes and 4× 6L6 power tubes.

When was the Fender Bassman Aa371 produced?

The Fender Bassman Aa371 was produced 1973–1977.

Fender Bassman Aa371 preset

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

The Bassman AA371 is a mid-CBS-era Bassman head revision running 50 watts through four 6L6 output tubes. The AA371 circuit reflects CBS-era refinements to the original AB763 topology.

Years produced: 1973–1977
Made in: USA
Wattage: 50W
Channels: 2
Preamp tubes: 3× 12AX7, 1× 12AT7
Power tubes: 4× 6L6

Tags: american, clean, silverface, vintage.

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.