What tubes does the Magnatone M-7 Bass use?

The Magnatone M-7 Bass uses 1× 12AX7, 1× 12AU7 preamp tubes and 2× 7189A power tubes.

When was the Magnatone M-7 Bass produced?

The Magnatone M-7 Bass was produced 1963–1966.

Magnatone M-7 Bass preset

Verified · 94/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Magnatone M-7 is a tube bass amp from Magnatone's M-series, with a two-stage 12AX7 preamp, a 12AU7 long-tailed-pair phase inverter and a push-pull pair of 7189A output tubes on a solid-state rectifier. It has high and low inputs, loudness and tone controls and a standby switch, driving a 15-inch speaker plus a small tweeter.

Years produced: 1963–1966
Made in: USA
Wattage: 20W
Channels: 1
Preamp tubes: 1× 12AX7, 1× 12AU7
Power tubes: 2× 7189A

Tags: american, vintage, bass.

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.