What tubes does the Valco 6400 - Normal use?

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

When was the Valco 6400 - Normal produced?

The Valco 6400 - Normal was produced 1960–1965.

Valco 6400 - Normal preset

Verified · 83/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Valco 6400 is a mid-range combo from the company's 1960s Supro lineup, delivering the characteristic bright, raw American tube tone through 6973 output tubes. The 6973 output tube gives this amp a unique compression character and harmonic signature distinct from more common 6V6 and 6L6 designs. Like all Valco amps of this era, the 6400 has become collectible for its distinctive voice and historical significance.

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.