Kay 507 - Channel 1 preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Kay K507 is a 1961 tube combo with two channels, each with two inputs, half a 20EZ7 twin triode, and its own tone and volume followed by its own half of a 6EU7. The channels mix into a 7199, whose pentode amplifies and whose triode is a split-load inverter for a push-pull pair of 7868s, with a 5U4 rectifier, driving two 8-ohm speakers. A 6AU6 oscillator provides tremolo with an intensity control and footswitch jack.

• Made in: USA
• Channels: 2
• Preamp tubes: 1× 20EZ7, 1× 6EU7, 1× 7199, 1× 6AU6
• Power tubes: 2× 7868

Tags: american, vintage, clean, two-channel.

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.