What tubes does the Valco 6400 1 use?

The Valco 6400 1 uses 2× 12AX7 preamp tubes and 2× 6973 power tubes.

When was the Valco 6400 1 produced?

The Valco 6400 1 was produced 1960–1965.

Valco 6400 1 preset

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

The Valco 6400 is a mid-range combo from the Supro lineup featuring the brand's distinctive bright, raw American tube tone through 6973 output tubes. This entry documents a variant or duplicate schematic source for the Valco 6400 circuit, providing additional reference material for restoration and research. The 6400 captures Valco's peak 1960s production in a versatile combo configuration.

Years produced: 1960–1965
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.