Estey Electronics 422 preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Model 422 is a small 1966 Estey amp from the company's Magnatone period. Three inputs feed a 12DW7 preamp with volume and tone controls, and one half of a 7025 acts as a paraphase inverter. A single 6UH8 (ELL80) dual pentode works as a cathode-biased push-pull output stage into a 12-inch speaker, with an external speaker jack. The other 7025 half is a phase-shift tremolo with speed, intensity and a footswitch, and the rectifier is a pair of silicon diodes.

• Made in: USA
• Channels: 1
• Preamp tubes: 1× 12DW7, 1× 7025
• Power tubes: 1× 6UH8

Tags: american, vintage, tremolo, 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.