Airline GDR-8517A - Channel A preset

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

The Airline GDR-8517A is a higher-powered version of the GDR-8516A. Its two channels with bass and treble and a vibrato circuit feed a 6SN7GT phase inverter and four 6L6s, with two output transformers driving two speakers.

• Made in: USA
• Wattage: 40W
• Channels: 2
• Preamp tubes: 2× 12AX7, 1× 6SN7GT, 1× 6AU6
• Power tubes: 4× 6L6

Tags: american, vintage, 6l6, 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.