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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: Datasheet & private communication. Type 931A was first introduced in 1950.


Absolute Maximum Operating Conditions
Electron Multipliers
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 05, 2015.
shape:wide.glass.tube type:photomultiplier age:1940.1950 base: pins:11 pin:
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