phototube

noun
pho·to·tube | \ˈfō-tō-ˌtüb, -ˌtyüb\

Definition of phototube 

: an electron tube having a photoemissive cathode whose released electrons are drawn to the anode by reason of its positive potential

First Known Use of phototube

1930, in the meaning defined above

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The first known use of phototube was in 1930

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