The CV2316 is a cold cathode photomultiplier. The data-sheet shows that it was used by the UK Atomic Energy Authority. The commercial Type was the EMI 6097B and the base is the special EMI 15 pin type.
The multiplier has a photocathode inside the end window and 11 stages of secondary emission amplification before the anode. The peak sensitivity is in the blue end of the visible spectrum. The sensitivity is rated at 200 Amps per Lumen.
The multiplier dynode stack.
Another view of the dynode stack with ceramic insulators and individual connections to the stages.
The all glass structure with the short base pins. The circle allows for 16 pins and one is blank to provide location information for fitting the base.
The end window and photocathode. Within the envelope can be seen the first dynode electrode. This is covered by a thin square mesh gauze to provide an even accelerating area.
The end window envelope is 51 mm in diameter, and excluding the base pins is 110 mm tall.
Reference: Datasheet. Type CV2316 was first introduced in 1955.