National-Dobro 510-1 preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The National-Dobro 510-1 is a Valco-built combo with two instrument inputs. A 6J7 pentode and a 6SC7 dual-triode phase inverter drive two 6V6GT output tubes in push-pull, with a 5Y3GT rectifier and a Jensen field-coil speaker, for about 12 watts.

• Made in: USA
• Wattage: 12W
• Channels: 1
• Preamp tubes: 1× 6J7, 1× 6SC7
• Power tubes: 2× 6V6GT

Tags: american, vintage, 6v6.

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.