National-Dobro Model D preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The National-Dobro Model D is a very early tube amplifier from the National-Dobro company. Two inputs feed a 6N7 dual triode, a second 6N7 serves as driver and phase inverter, and a push-pull pair of type 42 pentodes drives a field-coil speaker. An 80 rectifier supplies the power. It is an example of the first generation of electric-guitar amplification.

• Made in: USA
• Wattage: 8W
• Channels: 1
• Preamp tubes: 2× 6N7
• Power tubes: 2× 42

Tags: american, vintage, low-wattage.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.