National Twin-Tone 1210 (1958) preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The National Twin-Tone 1210 (1958) is a simple Valco-built practice amp with three inputs, volume and tone. Both halves of a single noval dual triode make two gain stages. They drive a single cathode-biased 6V6 in class A on a 5Y3 rectifier.

Tags: american, vintage, class-a, 6v6, low-wattage, practice.

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.