Magnatone 413 - Channel A preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Model 413 is an Estey-era Magnatone combo from Torrance, California, with Magnatone's varistor pitch vibrato. A and B inputs, each with high- and low-gain jacks on their own 12AX7 triode and Volume, share a Mellow/Normal/Bright switch and Tone control. A 12AU7 varistor stage shifts the pitch, driven by a 6AV6 oscillator with Speed and Intensity and a footswitch, then a 12AX7 phase inverter drives a push-pull pair of 6V6GTs on a 5Y3 rectifier.

Tags: american, vintage, vibrato, 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.