Airline GDR-8511A preset

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

The Airline GDR-8511A is a tiny Montgomery Ward practice amp using a transformerless AC/DC design. A 12AU6 pentode preamp drives a single 50C5 output tube, rectified by a 35W4, with a volume control as its only adjustment.

• Made in: USA
• Wattage: 1W
• Channels: 1
• Preamp tubes: 1× 12AU6
• Power tubes: 1× 50C5

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

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.