What tubes does the Valco National Dobro 510-1 - Instruments use?

The Valco National Dobro 510-1 - Instruments uses 1× 12AX7 preamp tubes and 2× 6V6 power tubes.

When was the Valco National Dobro 510-1 - Instruments produced?

The Valco National Dobro 510-1 - Instruments was produced 1940s–1950s.

Valco National Dobro 510-1 - Instruments preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The National-Dobro 510-1 is an early member of Valco's long-running 510 circuit family, featuring instrument and microphone inputs for the steel guitar and vocal amplification needs of the era. The 510 series was Valco's most commercially successful circuit design, produced across multiple decades and brand names. This early variant captures the pre-Supro era of Valco's design history.

Years produced: 1940s–1950s
Made in: USA
Wattage: 10W
Channels: 2
Preamp tubes: 1× 12AX7
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.