Summary

The 210HF is a medium mu general purpose triode.
The 210HF was introduced by Cossor around 1930 and apparently was designed into airborne equipment, which remained in use in the 1940s.
Manufactured for: Royal Air Force (UK). Probably manufactured by Cossor Ltd.
It has a 2 volt directly heated cathode. Used as a Class A amplifier.

Physical Description

Conical bulb on 4 pin European style base.

More Information