Kay 610 - Ch1 (upper) preset

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

The Kay 610 is a late-1950s to early-1960s tube combo from Kay's Chicago factory, bridging the older 500-series models and the later numbered 700/800 series. Its circuit delivers approximately 15 watts through a push-pull 6V6 or 6L6 output stage with a two-channel preamp that provides separate inputs for guitar and microphone with shared tone controls. The 610's tone is clean and American-voiced with a pleasant warmth in the low-mids and natural sag in the power section at higher volumes. It represents Kay's steady iterative improvement in amplifier design during a period of rapid growth in the electric guitar market.

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.