This exhibit is labelled within the John Lawrence Collection as a backward wave oscillator, which is a type of device related to the travelling wave tube amplifier in its operating principles.

Further information places this valve as possibly a Heil tube or possibly an external cavity reflex klystron.

The thin glass tube envelope is 20 mm in diameter and, excluding the base pins, is 87 mm long.

This exhibit was last updated on 28 October 2006