The CV371 is an EHT rectifier designed for high voltage power supplies generally. The prototypes for this CV specification were the VX2016 and VX6036. The CV371 rectifier was developed into a reliable rugged type the CV4057.
The minimum effective series resistance needs to be 5,400 Ohms to limit peak current and the maximum reservoir capacitor is limited to 1.1 μF.
The KB/K identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the K identifies the maker as ETEL, Electronic Tubes, High Wycombe.
The UK Government up arrow. The anode has additional ceramic insulators due to the high voltages involved.
The cathode side rods are joined at the top but the connection to the cathode tube is made at the bottom. The anode connection is made to the rod within the ceramic insulator.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 49 mm tall.
References: Data-sheet & 1040. Type CV371 was first introduced in 1949. See also1949 adverts.
