Westinghouse WL-787 "Demonstration Triode"

Westinghouse WL-787 "Demonstration Triode"
WL-787 in Operationi
The WL-787 tube was designed by Westinghouse as a classroom demonstration device in the late 1930's.  The plate was coated with a phosphor which lit up when struck by electrons emitted from the multiple parallel filament strands.  The action of bias voltage on the ladder-like grid, and external magnetic fields could be observed by watching the patterns of light emitted from the plate.  The tube is about 10 inches long, and is 2 5/8 inches in diameter.  The plate, itself, is 1 1/2 by 3 inches.
WL-787 Sticker
 

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