What tubes does the Valco Supro S6651 use?

The Valco Supro S6651 uses 3× 12AX7 preamp tubes and 4× 6L6 power tubes.

When was the Valco Supro S6651 produced?

The Valco Supro S6651 was produced 1964–1968.

Valco Supro S6651 preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Supro S6651 was a more powerful Supro model in the upper range of Valco's S-series, providing substantial output for professional live use while maintaining the Supro tonal character. Its higher-powered output stage gave it authority on stage while remaining capable of natural-sounding breakup at performance volumes. The S6651 represents Valco's attempt to serve professional Supro players in larger venue contexts.

Years produced: 1964–1968
Made in: USA
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 4× 6L6

Tags: american.

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.