National 1215 - Mic preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The National Model 1215, listed in National's 1949 catalog as the Professional, was a top-of-the-line Valco-built amp with microphone and instrument channels. A microphone input and three instrument inputs each feed their own 6SJ7 pentode stage and volume. The channels mix into a 6SN7 gain stage and a 6SL7 tone section with treble and bass, then a 6SN7 phase inverter driving two 6L6Gs from a 5U4G rectifier.

• Made in: USA
• Wattage: 20W
• Channels: 2
• Preamp tubes: 2× 6SJ7, 1× 6SL7, 2× 6SN7
• Power tubes: 2× 6L6G

Tags: american, vintage, clean, 6l6, two-channel.

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.