Dukane 1A475C preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Dukane 1A475C is a 75/100-watt valve program power amplifier for installed sound. It has a single input with one level control and no mic preamps: a 12AU7 provides two gain stages and a second 12AU7 the phase inverter, driving four 7867/6CD6GA beam tetrodes in push-pull parallel on fixed bias, with an OD3-regulated screen supply. Two 5U4GB rectifiers feed it, and the output transformer has 70-volt and 25-volt line taps.

Tags: american, vintage, power-amp, clean, high-wattage.

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.