Kay K-550 preset

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

The Kay K-550 is an unusual tube amp built from two separate single-ended sections, each with its own 6EU7, 6V6, output transformer and speaker, sharing a 5Y3 rectifier. The main section has three inputs, a volume and a treble-cut tone control (with the power switch on the tone pot). The second section has its own jack and is also fed through a small transformer marked Rev-1 from the main section, with its own Intensity control.

• Made in: USA
• Channels: 1
• Preamp tubes: 2× 6EU7
• Power tubes: 2× 6V6

Tags: american, vintage, 6v6.

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.