Jet City PicoValve preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Jet City PicoValve is a 5-watt, single-channel tube head of 2010, licensed from THD Electronics and designed by its founder Andy Marshall. Two 12AX7s give three cascaded gain stages with a gain control and a cathode follower driving a treble, middle and bass stack, then a master volume. Its single-ended, cathode-biased octal power valve (6L6 stock) takes an EL34, 6V6 and similar types without rebiasing; a switch halves the power.

Tags: modern, low-wattage, practice.

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.