What tubes does the Valco Oahu 230K use?

The Valco Oahu 230K uses 1× 12AX7 preamp tubes and 2× 6V6 power tubes.

When was the Valco Oahu 230K produced?

The Valco Oahu 230K was produced 1955–1962.

Valco Oahu 230K preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Oahu 230K was a Valco-built amplifier sold under the Oahu Publishing Company brand, a Cleveland-based firm that sold Hawaiian music instruction courses bundled with lap steel guitars and amplifiers. Its warm, clean tone was optimised for the Hawaiian steel guitar style that Oahu actively promoted through its correspondence courses. Oahu-branded Valco amps are now collected for their attractive styling and connections to the Hawaiian guitar tradition in America.

Years produced: 1955–1962
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.