National-Dobro Model C preset

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

The Model C is an early National-Dobro amplifier from the first generation of amps built for electric steel and Spanish guitars. Two inputs feed a 6N7 dual-triode preamp and a single volume control; a second 6N7 serves as gain stage and paraphase inverter for a pair of cathode-biased 6V6s. A type 80 rectifier supplies the circuit and the speaker's field coil doubles as the filter choke. There is no tone control and no negative feedback.

• Made in: USA
• Wattage: 10W
• Channels: 1
• Preamp tubes: 2× 6N7
• Power tubes: 2× 6V6

Tags: american, vintage.

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.