The CV2318 (commercially the A2272) is a high voltage rectifier for use in high ambient temperatures. It can also be used as an efficiency diode.
The KB/Z identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the Z identifies the maker as MO Valve Company, Hammersmith.
The central anode has the surface increased by the addition of six fins.
The high voltages involved are the reason for using ceramic insulators. The fixing of the fins can be seen.
Top view: the inner structure remains obscure.
The lower insulator and screen above the base.
The wide glass envelope is 39 mm in diameter and, excluding the B9G base pins, is 97 mm tall.
References: Data-sheet. Type CV2318 was first introduced in 1955. See also1955 adverts.
