The CV1072 is a half wave mercury vapour rectifier. The prototypes were the GU50, RG1/240 and the MU4250. Previous service names were AU6 and VU72.
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 internal coating will help reduce the UV originating in the discharge.
The anode connected only to the top cap is shaped for rigidity.
The twin corrugated ribbon filaments. SeeGU50 for a clearer image.
