Oahu Early Amp (c. 1941) preset

Close · 72/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Oahu 230K is an early tube amp, perhaps from around 1941, sold under the Oahu brand of the Cleveland lap-steel and lesson company. Two inputs each feed half of a 6N7 dual triode, one through a volume control, and a 25K 'power' control trims the preamp supply. A 6C5 triode drives a 6N6, a direct-coupled tube with its driver and output sections in one envelope, into a field-coil speaker, with a 5Y3 rectifier and a choke-filtered supply.

• Made in: USA
• Channels: 1
• Preamp tubes: 1× 6N7, 1× 6C5
• Power tubes: 1× 6N6

Tags: american, vintage, clean.

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.