The CV3797 is a caesium photocell with a common anode rod and twin semi-circular photo cathodes. The bottom cathode is k(1) and the top k(2). The commercial equivalent is the V944A and this is quoted in the specification.
The KB/E identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the E identifies the maker as Thorn-AEI, Brimsdown.
The stacked cathodes are seen side on.
The front view of the photocell.
The wide glass tube envelope is 25 mm in diameter and, excluding the IO base pins, is 76 mm tall.
Reference: Data-sheet. Type CV3797 was first introduced in 1951. See also1951 adverts.
