What tubes does the Airline GDR-8502A - Normal use?

The Airline GDR-8502A - Normal uses 12AX7 preamp tubes and 6V6 power tubes.

When was the Airline GDR-8502A - Normal produced?

The Airline GDR-8502A - Normal was produced 1962–1966.

Airline GDR-8502A - Normal preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Airline GDR-8502A is a compact Valco-built tweed-era style practice amp sold through Montgomery Ward. Its single-channel circuit employs a 12AX7 preamp stage feeding a single-ended 6V6 power section, producing around 5 watts of warm, touch-responsive tone. The simple treble and volume controls give players direct access to the amp's natural breakup character, which blooms with a pleasing mid-heavy saturation. These little Valco-branded Airline amps are considered sleeper gems among vintage amp collectors.

Years produced: 1962–1966
Made in: USA
Wattage: 5W
Channels: 1
Preamp tubes: 12AX7
Power tubes: 6V6

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.