Kay K-500/K-505/K-506/K-520/K-550 Series - Normal preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Kay K-500/K-505/K-506/K-520/K-550 series encompasses a range of affordable student tube guitar amplifiers produced by Kay in Chicago during the 1950s and 1960s. These amps shared similar circuit topologies across the line, with varying wattage and feature sets. Today they are popular among blues and garage enthusiasts seeking authentic lo-fi vintage tone.

• Years produced: 1955–1968
• Made in: USA
• Channels: 1

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.