[foh-tuh-toob, -tyoob]
noun Electronics.
an electron tube with a photosensitive cathode, used like a photocell.
Also called photoelectric tube.

1925–30; photo- + tube Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
phototube (ˈfəʊtəʊˌtjuːb)
a type of photocell in which radiation falling on a photocathode causes electrons to flow to an anode and thus produce an electric current

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
After the scintillator is done being polished, it is ready to be glued to the
Phototube measures beam induced light emission with sub ns resolution.
Also, to study luminescence the phototube is replaced with a scanning
The baseline phototube design has a large gain so that signal to common mode
  noise should be large.
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