What tubes does the Airline GDR-8511A - Normal use?

The Airline GDR-8511A - Normal uses 12AX7, 12AU7 preamp tubes and 6V6, 6V6 power tubes.

When was the Airline GDR-8511A - Normal produced?

The Airline GDR-8511A - Normal was produced 1963–1967.

Airline GDR-8511A - Normal preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Airline GDR-8511A is a mid-range Valco-manufactured combo sold under the Montgomery Ward Airline brand. It features a two-channel layout with separate inputs for guitar and microphone, using a 12AX7 and 12AU7 preamp configuration feeding a push-pull 6V6 power stage. The resulting 10–12 watt output provides enough headroom for small venues while still breaking up with character at moderate volumes. The tremolo circuit, a hallmark of Valco designs, produces a warm, organic pulse that defines the era's sound.

Years produced: 1963–1967
Made in: USA
Wattage: 12W
Channels: 2
Preamp tubes: 12AX7, 12AU7
Power tubes: 6V6, 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.