What tubes does the Fender Bassman Aa864 use?

The Fender Bassman Aa864 uses 3× 12AX7, 1× 12AT7 preamp tubes and 4× 6L6 power tubes.

When was the Fender Bassman Aa864 produced?

The Fender Bassman Aa864 was produced 1964–1965.

Fender Bassman Aa864 preset

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

The Bassman AA864 is among the earliest blackface Bassman heads, using the AA864 circuit designation from 1964. At 50 watts with four 6L6 output tubes, it represents the clean break from the brownface era into the brighter, more scooped blackface sound.

Years produced: 1964–1965
Made in: USA
Wattage: 50W
Channels: 2
Preamp tubes: 3× 12AX7, 1× 12AT7
Power tubes: 4× 6L6

Tags: american, clean, blackface, 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.