Kay 720 preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Kay 720 is one of Kay's more powerful tube amps, suited to bass as well as guitar. Three inputs feed a 5879 pentode preamp, then one volume and one tone control, and a 7199 whose pentode adds gain and whose triode is a split-load phase inverter. Two 6L6GCs, cathode-biased through a shared resistor, drive a 15-inch 8-ohm speaker from a 5U4GB rectifier, at roughly 40 watts. Clean and full, with plenty of headroom.

• Made in: USA
• Wattage: 40W
• Channels: 1
• Preamp tubes: 1× 5879, 1× 7199
• Power tubes: 2× 6L6GC

Tags: american, vintage, 6l6, clean, bass, mid-wattage.

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.