What tubes does the Kay K-520 - Normal use?

The Kay K-520 - Normal uses 12AX7, 12AX7 preamp tubes and 6V6, 6V6 power tubes.

When was the Kay K-520 - Normal produced?

The Kay K-520 - Normal was produced 1957–1963.

Kay K-520 - Normal preset

Close · 76/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Kay 520 is a late-1950s tube combo from Kay's Chicago factory, offering a step up in power and features within the company's budget amplifier range. Its push-pull 6V6 or 6L6 power section delivers approximately 15–20 watts with a clean, open American tone character, and the preamp provides bass, treble, and volume controls for basic tonal shaping. The two-channel layout accommodates guitar and microphone inputs, a common feature of working band amplifiers of the period. The Kay 520 is a reliable, straightforward example of late-1950s American budget amplifier construction.

Years produced: 1957–1963
Made in: USA
Wattage: 18W
Channels: 2
Preamp tubes: 12AX7, 12AX7
Power tubes: 6V6, 6V6

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.