What tubes does the Valco Harmony 430 use?

The Valco Harmony 430 uses 1× 12AX7 preamp tubes and 2× 6V6 power tubes.

When was the Valco Harmony 430 produced?

The Valco Harmony 430 was produced 1962–1967.

Valco Harmony 430 preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Harmony 430 was a Valco-built amplifier sold under the Harmony brand, a Chicago-based guitar and amplifier company with close ties to Valco throughout the 1950s and 1960s. Its simple valve circuit offered affordable amplification aimed at students and beginners entering the guitar market during the folk and rock 'n' roll boom. Harmony-branded Valco amps are now appreciated for their straightforward, honest tone.

Years produced: 1962–1967
Made in: USA
Channels: 1
Preamp tubes: 1× 12AX7
Power tubes: 2× 6V6

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.