apco

Apco Twin
DC Det/Amp Triode
1925


The Apco Twin has a single triode section but uses an "M" style filament that is center-tapped. Metal tabs on the base allow selection of either half of the filament, or both halves at once. Using one half resulted in '01A performance. If both halves were used at once, the tube could be used as an output tube.

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