Airline GDR-9015A - Channel B preset

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

The Airline GDR-9015A is a two-channel Montgomery Ward tube combo with two 4-ohm speakers. Each channel has two inputs, its own half of the first 12AX7 and its own Bass, Treble and Volume; a 6CG7 drives and recovers a spring reverb with a Reverb control. A 6AU6 oscillator adds vibrato with Strength, Speed and a footswitch. The second 12AX7 provides gain and phase inversion for two cathode-biased 6L6GCs, with a 5Y3 rectifier.

• Made in: USA
• Wattage: 35W
• Channels: 2
• Preamp tubes: 2× 12AX7, 1× 6CG7, 1× 6AU6
• Power tubes: 2× 6L6GC

Tags: american, vintage, 6l6, reverb, vibrato, two-channel, mid-wattage.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.