What tubes does the Fender Bassman 6G6-A - Bass use?

The Fender Bassman 6G6-A - Bass uses 4× 7025 preamp tubes and 2× 5881 power tubes.

When was the Fender Bassman 6G6-A - Bass produced?

The Fender Bassman 6G6-A - Bass was produced 1962.

Fender Bassman 6G6-A - Bass preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 6G6-A is a revision of the early-1960s brownface piggyback Bassman head. The Bass channel has two inputs, a 7025 with a bass control and volume, and a second 7025 stage feeding a treble control; the Normal channel has a 7025 with treble, bass and volume. A shared presence control sits in the feedback loop, and a 7025 long-tail inverter drives two fixed-bias 5881s from a silicon diode rectifier into two speakers.

Years produced: 1962
Made in: USA
Wattage: 50W
Channels: 2
Preamp tubes: 4× 7025
Power tubes: 2× 5881

Tags: american, vintage, brownface, bass, 6l6, clean.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.