Kay 703-C preset

Verified · 84/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Kay 703-C is a small practice amp that uses series-string tubes in place of the 703's 12AU6/50L6 line-up: an 18GD6A pentode preamp, a single-ended 60FX5 beam pentode and a 36AM3 rectifier, with an isolation transformer on the mains side. It has three inputs with tone and volume and makes about 3 watts into an 8-ohm speaker. It breaks up almost immediately, a lo-fi sound prized for recording.

• Made in: USA
• Wattage: 3W
• Channels: 1
• Preamp tubes: 1× 18GD6A
• Power tubes: 1× 60FX5

Tags: american, vintage, practice, low-wattage, breakup.

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.