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The Twenty-Kilowatt Tube - Irving Langmuir
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This exhibit is a 1915 Experimental Pliotron from the William White G E Museum Collection, Schenectady, New York. Tyne collection. It was never fitted with a base cap.
Thanks to Joe Gruber for sending the image.
The envelope is  mm in diameter and, excluding the base pins, is  mm tall.
References: J Gruber & 1047. Type Pliotron was first introduced in 1915.


Updated October 20, 2019.
shape:balloon construction:pinch type:triode age:pre.1920 base: pin:
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