The AUDIOTRON was a triode designed for early battery receivers starting in 1915. It was a pirate tube made by Cunningham in Oakland, California. All examples differ with respect to length and often diameter. The first example has one filament and the others have dual filaments.
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The AUDIOTRON was a triode designed for early battery receivers starting in 1915. It was a pirate tube made by Cunningham in Oakland, California. All examples differ with respect to length and often diameter. The first example has one filament and the others have dual filaments.