Supro S6611 preset

Verified · 91/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Supro S6611 is a small transformerless AC/DC practice amp from Valco. Two inputs feed a 12AX7 whose two halves run in cascade around a single 500K volume control; there is no tone control and no negative feedback. A single 50L6 beam tetrode runs single-ended into an 8-inch 3.2-ohm speaker, with a half-wave rectifier fed straight off the mains and series-string heaters.

• Made in: USA
• Wattage: 5W
• Channels: 1
• Preamp tubes: 1× 12AX7
• Power tubes: 1× 50L6

Tags: american, vintage, 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.