Kay 859 preset

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

The Kay 859 is an early, very simple tube amp. A Guitar input, through a fixed divider, and a Mic input with its own volume each feed half of a 6C8G twin triode, mixed into a 6C5 gain stage. That drives a 6N6, a direct-coupled tube with driver and output sections in one envelope, single-ended into an 8-inch field-coil speaker that plugs into the chassis. A type 80 rectifier and choke power it. Low-powered, with a soft, early breakup.

• Made in: USA
• Wattage: 3W
• Channels: 1
• Preamp tubes: 1× 6C8G, 1× 6C5
• Power tubes: 1× 6N6

Tags: american, vintage, low-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.