National-Dobro Model 60 preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The National-Dobro Model 60 dates from 1939. A 6SJ7 pentode and 6SF5 triode preamp drive two 6K6 beam-power output tubes, with an 80 rectifier, a field-coil speaker socket and a combined volume/on-off control.

• Made in: USA
• Channels: 1
• Preamp tubes: 1× 6SJ7, 1× 6SF5
• Power tubes: 2× 6K6

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.