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westinghouse tube WL787

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ojim:
Hello. I'm looking for a WL 787 tube and/or data. Westinghouse made this tube for demonstration purposes. This WL 787 was made to show visually the effect of the grid on current flow.The tube has several filaments, a grating grid and a fluorescent screen. Any help finding the tube, description, references or data sheets will be most welcome. I can buy or trade. Thanks,

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