The CV2492 E88CC is a special quality double triode. The design use was in cascode circuits or HF of IF amplifiers. Additionally it was specified for use in computer circuits for multivibrator and cathode follower use - analogue computers.
The two sections with an electrostatic screen between.
The depression in the anode is the same width as the rectangular cathode tube.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 46 mm tall.
Reference: Data-sheet. Type CV2492 was first introduced in 1959. See also1959 adverts.