Kay 803 preset

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

The Kay 803 is a compact tube combo from Kay's early 1960s catalog, representing a mid-tier model in the numbered 800-series lineup. Its single-ended or modest push-pull output stage delivers a warm, natural tone characteristic of Kay's Chicago-built tube amplifiers, with a single-channel circuit optimized for guitar rather than the dual-purpose guitar/microphone designs of larger models. The 803's simple, serviceable circuit and compact cabinet made it a practical choice for students and casual players who needed more than a practice amp could offer. It is a representative example of Kay's workmanlike approach to affordable American amplification.

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.