Dukane 1A45A preset

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

The Dukane 1A45A is a late-1940s valve public-address amplifier built for installed sound. Four identical microphone inputs, each with its own 6J7 pentode and level control, plus a phono input with its own level, mix into a further 6J7 gain stage with tone controls. A 6SN7 paraphase inverter drives four 6L6G output valves in push-pull parallel into a multi-tap output transformer, powered by two 5U4G rectifiers.

• Made in: USA
• Channels: 1
• Preamp tubes: 5× 6J7, 1× 6SN7
• Power tubes: 4× 6L6G

Tags: american, vintage, 6l6, 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.