Airline 62-9021A (12L6 conversion) - Main preset

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

This Airline 62-9021A with 12L6 tube conversion is a modified version of the Valco-built Airline combo, swapping the standard output tubes for the unusual 12L6 type, which runs on lower voltages and produces a distinctively compressed, saturated tone. The 12L6 conversion (also found in certain Supro models) creates a thick, midrange-heavy sound well-suited to blues and slide guitar, and is associated with the tone heard on classic Chicago blues recordings. This circuit variation is particularly prized by tone enthusiasts for its unique and musical output tube saturation character.

• Years produced: 1962–1967
• Made in: USA
• Channels: 1
• Preamp tubes: 12AX7
• Power tubes: 12L6

Known for: Jimmy Page.

Heard on: Whole Lotta Love (live) — Jimmy Page (1969).

Tags: american, vintage, crunch.

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.