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Sensibly equivalent to:
27M1 CV337
See also:
Electron Multipliers - CV337 short entry
Extras ▼


The 931A is a photomultiplier, but was not always used as such.
This exhibit was used as a noise source in a jamming transmitter system. Obviously used to generate a spectrum of white noise.
Operating conditions: an anode voltage of 100 V and a cathode current of 0.025 mA. The gain is 1,000,000 and the sensitivity is 10A/Lumen at a wavelength of 420 nM.
The photomultiplier is a cold cathode device.
The wide glass tube envelope is 28 mm in diameter and, excluding the special base pins, is 72 mm tall.
Reference: Data-sheet & private communication. Type 931A was first introduced in 1950. See also 1950 adverts.


Absolute Maximum Operating Conditions
Electron Multipliers
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 05, 2015.
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