Magnatone M-15 - Channel 1 preset

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

A 1960s Magnatone M-15 stereo combo. Two channels, each with high- and low-gain inputs on a 7025, their own Bass, Treble and Loudness and a contour switch, plus a stereo input, feed Magnatone's varistor pitch vibrato (12AU7 bridges, 12DW7 oscillator, instrument/stereo selector) and a delay-line reverb with footswitch. Two 7247/12DW7 inverters drive two push-pull pairs of 7189As, one per side.

• Years produced: 1963–1964
• Made in: USA
• Channels: 2
• Preamp tubes: 4× 7025, 3× 12DW7, 3× 12AU7
• Power tubes: 4× 7189A

Known for: Keith Richards.

Tags: american, vintage, vibrato, reverb, stereo, two-channel.

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.