What tubes does the Magnatone 431 use?

The Magnatone 431 uses 2× 7025, 1× 12AU7, 1× 7247 preamp tubes and 1× 6GW8 power tubes.

When was the Magnatone 431 produced?

The Magnatone 431 was produced 1964–1966.

Magnatone 431 preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Magnatone 431 is a compact 1960s combo with a 10-inch speaker. High, medium and low inputs feed one channel built on two 7025s, with Volume and Tone, a 12AU7 varistor stage for Magnatone's pitch vibrato and a modulation selector that switches to tremolo, with Speed, Intensity and a footswitch. A delay-line reverb stage with a 12AU7/7247 driver follows, and a single 6GW8 output valve runs from a solid-state rectifier.

Years produced: 1964–1966
Made in: USA
Channels: 1
Preamp tubes: 2× 7025, 1× 12AU7, 1× 7247
Power tubes: 1× 6GW8

Tags: american, vintage, vibrato, tremolo, reverb, low-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.