Magnatone 440 - Channel 2 preset

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

The Magnatone 440 is an Estey-era two-channel combo from Magnatone's Custom 400 series, known for its varistor true pitch vibrato rather than simple tremolo. Each channel has high- and low-gain inputs on a 6EU7 triode and its own Volume, sharing one Tone control. A 6DR7 drives spring reverb with a footswitch, a 12AU7 varistor stage gives the vibrato, and a pair of 6V6GTs on a 6CA4 rectifier drives a 12-inch speaker.

• Years produced: 1961–1963
• Made in: USA
• Channels: 2
• Preamp tubes: 2× 6EU7, 1× 12AX7, 1× 12AU7, 1× 6DR7
• Power tubes: 2× 6V6GT

Known for: Lonnie Mack.

Tags: american, vintage, vibrato, reverb, 6v6, 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.