Airline GDR-9012A preset

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

The Airline GDR-9012A is a simple single-ended Montgomery Ward instrument amp. A 12AX7 preamp drives one 6V6GT for about 5 watts, with a 6X5GT rectifier, tone and volume controls and two inputs, much like small student amps of the period.

• Made in: USA
• Wattage: 5W
• Channels: 1
• Preamp tubes: 1× 12AX7
• Power tubes: 1× 6V6GT

Tags: american, vintage, 6v6, class-a, 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.