What tubes does the Fender Bassman 70 - Normal use?

The Fender Bassman 70 - Normal uses 3× 7025, 1× 12AT7 preamp tubes and 2× 6L6GC power tubes.

When was the Fender Bassman 70 - Normal produced?

The Fender Bassman 70 - Normal was produced 1977–1983.

Fender Bassman 70 - Normal preset

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

The Bassman 70 is a silverface-era Fender bass head rated 70 watts RMS. The Bass Instrument channel has volume, treble, bass and a Deep switch, and the Normal channel has volume, treble, bass and a bright switch. Both feed a further 7025 gain stage and a master volume, then a 12AT7 long-tail inverter drives a fixed-bias pair of 6L6GCs from a silicon bridge rectifier, with an output tube matching trim and a line/recording out. It is voiced warmer and fuller than the guitar amps of the same period.

Years produced: 1977–1983
Made in: USA
Wattage: 70W
Channels: 2
Preamp tubes: 3× 7025, 1× 12AT7
Power tubes: 2× 6L6GC

Tags: american, vintage, silverface, bass, 6l6, high-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.