The CV295 is a protection spark gap used to protect the receiver front end of a radar set during the transmit pulse. When triggered the receiver input is effectively short circuited.
The peak current through the tube is 50 Amps.
The KB/QG identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the Q identifies the maker as English Electric Valve Co., Chelmsford. The QG refers to a location that we do not have listed.
The English Electric label on the base cap. The spark contacts are shielded by the ceramic ring inside the envelope. Normally a spark gap would have a low pressure gas filling - possible water vapour - to provide a low impedance path once ionisation has occurred.
The lower electrode L is protected by the disc insert to the ceramic ring.
The upper electrode U is protected by the disc insert to the ceramic ring. The lower electrode connection through the hard glass base disc is a thick strut.
The wide glass tube envelope is 30 mm in diameter and, excluding the IO base pins, is 64 mm tall.
