National 1212 preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The National Model 1212 (c. 1953) is a Valco-built combo. A 6J7 pentode input stage and a 6SN7 phase inverter drive two 6V6GT output tubes in push-pull, with a 5Y3GT rectifier and a field-coil speaker. It has a single volume control and two inputs.

• Made in: USA
• Wattage: 14W
• Channels: 1
• Preamp tubes: 1× 6J7, 1× 6SN7
• Power tubes: 2× 6V6GT

Tags: american, vintage, clean, 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.