Phototube


[foh-tuh-toob, -tyoob] /ˈfoʊ təˌtub, -ˌtyub/

noun, Electronics.
1.
an with a photosensitive cathode, used like a photocell.
/ˈfəʊtəʊˌtjuːb/
noun
1.
a type of photocell in which radiation falling on a photocathode causes electrons to flow to an anode and thus produce an electric current

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