What tubes does the Fender Bassman 20 use?

The Fender Bassman 20 uses 2× 7025 preamp tubes and 2× 6V6GTA power tubes.

When was the Fender Bassman 20 produced?

The Fender Bassman 20 was produced 1982–1983.

Fender Bassman 20 preset

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

The Bassman 20 is an early-1980s Fender tube bass amp: one channel with treble, middle and bass, a 7025 long-tail phase inverter and a pair of fixed-bias 6V6GTAs on a silicon rectifier. The factory schematic rates it at about 18 watts RMS, and it has a line/recording output.

Years produced: 1982–1983
Made in: USA
Wattage: 18W
Channels: 1
Preamp tubes: 2× 7025
Power tubes: 2× 6V6GTA

Tags: american, bass, 6v6, low-wattage, clean.

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.