What tubes does the Airline GDR-8518A - Normal use?

The Airline GDR-8518A - Normal uses 12AX7, 12AX7, 12AU7 preamp tubes and 6L6, 6L6 power tubes.

When was the Airline GDR-8518A - Normal produced?

The Airline GDR-8518A - Normal was produced 1965–1968.

Airline GDR-8518A - Normal preset

Close · 72/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Airline GDR-8518A is one of the flagship Valco-built Airline combos, delivering a robust output through a pair of 6L6 tubes in a well-braced cabinet with a 15-inch speaker. Its preamp stages provide separate instrument and microphone channels, making it versatile for the working musician or small band of the mid-1960s. The tone is open and clear at stage volume, with Valco's gentle tremolo circuit adding organic movement when engaged. Today it is appreciated by slide and blues players drawn to its warm, vintage American character.

Years produced: 1965–1968
Made in: USA
Wattage: 40W
Channels: 2
Preamp tubes: 12AX7, 12AX7, 12AU7
Power tubes: 6L6, 6L6

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.