What tubes does the Valco Supro S 6424 use?

The Valco Supro S 6424 uses 2× 12AX7 preamp tubes and 2× 6973 power tubes.

When was the Valco Supro S 6424 produced?

The Valco Supro S 6424 was produced 1962–1968.

Valco Supro S 6424 preset

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

The Supro S6424 is a mid-range combo from Valco's Supro lineup, built around the 6973 output tube for the characteristically warm and compressed American tone associated with the brand. Like other Supro models of the era, the S6424 has attracted interest from blues and vintage rock players for its natural harmonic character and touch sensitivity. Valco's Supro line represents some of the most musically compelling American amp designs of the 1960s.

Years produced: 1962–1968
Made in: USA
Wattage: 14W
Channels: 2
Preamp tubes: 2× 12AX7
Power tubes: 2× 6973

Tags: american, vintage.

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.