What tubes does the Airline GDR-8512A - Normal use?

The Airline GDR-8512A - Normal uses 12AX7 preamp tubes and 6V6 power tubes.

When was the Airline GDR-8512A - Normal produced?

The Airline GDR-8512A - Normal was produced 1960–1968.

Airline GDR-8512A - Normal preset

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

The Airline GDR-8512A is a budget tube combo amplifier from the Airline brand's mid-1960s lineup, sold through Montgomery Ward and manufactured by Valco. The GDR designation indicates a reverb-equipped model, giving players basic spring reverb alongside the amp's characterfully gritty tube tone. Valco's economic circuit designs produced amps with a raw, honest quality that has made them popular with blues and roots music players in the vintage market.

Years produced: 1960–1968
Made in: USA
Channels: 2
Preamp tubes: 12AX7
Power tubes: 6V6

Tags: american, vintage.

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.