What tubes does the Airline Wards GDR-8517A - Channel A use?

The Airline Wards GDR-8517A - Channel A uses 12AX7 preamp tubes and 6V6 power tubes.

When was the Airline Wards GDR-8517A - Channel A produced?

The Airline Wards GDR-8517A - Channel A was produced 1962–1968.

Airline Wards GDR-8517A - Channel A preset

Verified · 91/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Wards GDR-8517A is a Valco-built reverb tube combo from the Wards/Airline lineup of the mid-1960s, closely related to the 8516A with minor circuit variations. The consistent quality across the GDR 85xx series reflects Valco's streamlined manufacturing approach, which kept production costs low while maintaining musical tube circuit performance. The 8517A offers the same raw, warm reverb combo tone that characterizes the entire Wards/Airline GDR family.

Years produced: 1962–1968
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.