The CV172 diode is a specially constructed directly heated noise source. The pressed glass base was developed by Mullard in 1938 and this must date from before the 1941 introduction of the CV system by virtue of its low CV number. We have no operating details or indication of its use. It could be as a test source or as a feeder for a jamming transmitter.

The wide glass tube envelope is 32 mm in diameter and, excluding the B9G base pins, is 58 mm tall.

This exhibit was last updated on 02 December 2007