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The 1645A is a small vacuum photocell on a three pin base. As yet no data has been found.
The black cathode is a half cylinder with the square ring wire anode in front.
The thin glass tube envelope is 18 mm in diameter, and excluding the base pins is 50 mm tall.
References: Observation. Type 1645A was first introduced in 1952. See also 1952 adverts.


Updated December14, 2015.
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