The CV3798 is a 75 Volt voltage stabiliser tube. The prototypes for this stabiliser were the OA3 and the VR75-30.
The striking voltage is 100 but a supply of 105 Volts is suggested to take into account tolerances. The minimum current is 5 mA and in the working range of 5 - 40 mA the voltage regulation is 5 Volts.
The KB/F identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the F identifies the maker as STC, Paignton.
The STC logo plus the equivalents OA3 and VR75/30.
The construction is a cylindrical cathode and a central rod anode. Low pressure gas fills the envelope.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 91 mm tall.
References: Data-sheet, 1040 & 3002. Type CV3798 was first introduced in 1943. See also1943 adverts.
