Kay 720 - Normal preset

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

The Kay 720 is a mid-to-upper model in Kay's 700-series tube amp lineup, delivering approximately 20 watts through a push-pull 6L6 output stage in a larger combo cabinet than the 703 and 704. Its circuit includes Kay's vibrato/tremolo effect alongside a two-channel preamp with separate volume and shared tone controls, placing it among the more feature-complete Kay tube combos of the mid-1960s. The 720's clean, American-voiced tone with functioning tremolo makes it a natural choice for country, rockabilly, and early surf playing. It is among the more collectible of the mid-tier Kay amps and is a capable vintage instrument in restored condition.

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.