This paper discusses the operation and characteristics of electrostatic photo‐multipliers, using the Western Electric D‐159076 photo‐multiplier as an example to illustrate specific points. The following subjects are discussed: description of operation, advantages and applications, typical operating conditions, variation of sensitivity with voltage, hum due to ripple in power supply, effect of unequal voltage division, output impedance, linearity of response and fluctuation noises.

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