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.

 
Absolute Maximum Operating Conditions

Photomultiplier	Va	mAa
	1250	10.0

Thanks to Frank Philipse for supplying the above datasheet

More

This exhibit was last updated on 09 February 2008 {find valves by name}