Kay 859 - Guitar preset

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

The Kay 859 is a vintage American guitar amplifier produced by the Kay Musical Instrument Company of Chicago during the postwar era. Kay amps were affordable student-grade instruments aimed at beginners and the budget market, often featuring simple single-channel designs with tremolo. Their lo-fi tone has made them appealing to blues and garage rock players.

Tags: american, vintage.

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.