The CV1073 (commercially the H63) is a high gain audio voltage amplifier and used for transmitter applications.
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 reverse carries the H63 designation indicating direct equivalence.
There are two grids in this triode but the outer grid is strapped to the anode below the lower mica.
Distorted by the glass, the outer grid can be seen to be close wound.
The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 85 mm tall.
References: Data-sheet, 4001 & 1040. Type CV1073 was first introduced in 1937. See also1937 adverts.
