What tubes does the Valco 6143 use?

The Valco 6143 uses 2× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Valco 6143 produced?

The Valco 6143 was produced 1961–1967.

Valco 6143 preset

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

The Valco 6143 was a specific chassis model from Valco's numbered series, sold under house brands including National and Supro during the 1960s. Its all-valve circuit followed the Valco convention of a straightforward preamp and a 6L6 or 6V6 push-pull output stage, delivering a warm, American-flavoured clean tone with available tremolo on some versions. These amps are valued today for their simplicity and responsiveness.

Years produced: 1961–1967
Made in: USA
Channels: 2
Preamp tubes: 2× 12AX7
Power tubes: 2× 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.