What tubes does the Magnatone M-20 - Rhythm use?

The Magnatone M-20 - Rhythm uses 5× 7025, 6× 12AU7, 1× 12DW7, 2× 7247 preamp tubes and 4× EL34 power tubes.

When was the Magnatone M-20 - Rhythm produced?

The Magnatone M-20 - Rhythm was produced 1965–1967.

Magnatone M-20 - Rhythm preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Magnatone M-20 is a 1965 two-chassis stereo rig from Magnatone's M-series. The preamp has five input sections on 7025s, each with its own Volume: lead and rhythm instrument inputs with Bass, Treble and contour switches, two mic inputs and a bass input. 12AU7 stages run delay-line reverb and the varistor pitch vibrato with a stereo selector, and the power amp's two 7247 inverters drive two pairs of 6CA7/EL34s.

Years produced: 1965–1967
Made in: USA
Channels: 2
Preamp tubes: 5× 7025, 6× 12AU7, 1× 12DW7, 2× 7247
Power tubes: 4× EL34

Tags: american, vintage, el34, vibrato, high-wattage, two-channel.

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.