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ID = 31035
Tube type:  Vibrator 
Identical to 540-113

Description Chopper. Center tapped coil wires are terminated on four a large pins base. SPDT contacts are on top three pins connector. Ballantine branded, possibly Airpax production. 
Information source -- Collector info (Sammler)   
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540-113: Private collection
Emilio Ciardiello

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