Kay K-520 preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Kay K-520 is one of Kay's larger tube amps: a 5879 pentode preamp and 7199 driver/phase inverter drive a push-pull pair of 6L6s for about 30 watts, with a 5U4 rectifier and a 15-inch speaker. It has three inputs with one volume and one tone control. The 6L6 power section gives it a loud, full clean sound for its time.

• Made in: USA
• Wattage: 30W
• Channels: 1
• Preamp tubes: 1× 5879, 1× 7199
• Power tubes: 2× 6L6

Tags: american, vintage, 6l6, clean, 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.