National-Dobro Model 75 preset

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

The National-Dobro Model 75 is a 1943 five-tube amplifier. A 6J7 pentode and a 6N7 dual triode drive a push-pull pair of 6L6G output tubes, with a 5V4G rectifier, a Jensen field-coil speaker and multiple inputs, for about 15 watts.

• Made in: USA
• Wattage: 15W
• Channels: 1
• Preamp tubes: 1× 6J7, 1× 6N7
• Power tubes: 2× 6L6G

Tags: american, vintage, 6l6.

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.