What tubes does the Kay K-750 use?

The Kay K-750 uses 12AX7, 12AX7 preamp tubes and 6L6, 6L6 power tubes.

When was the Kay K-750 produced?

The Kay K-750 was produced 1961–1966.

Kay K-750 preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Kay 750 is a higher-powered tube combo from Kay's early-to-mid 1960s lineup, offering a 6L6-based push-pull output stage producing approximately 25–30 watts. Its Chicago-built construction gives it a solid, practical build quality, and the two-channel circuit with independent volume and shared tone controls provides basic versatility for the working musician. The tone is clean and American-voiced with a warm low end and present midrange, suited to country, rockabilly, and early rock and roll. The Kay 750 is a functional vintage amp that punches above its humble origins when in good condition.

Years produced: 1961–1966
Made in: USA
Wattage: 30W
Channels: 2
Preamp tubes: 12AX7, 12AX7
Power tubes: 6L6, 6L6

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.