High voltage half wave rectifier. Used in the EHT supply for cathode ray tube displays used in radar and instruments.
The JAN-CNU prefix to the type number on the base indicates that the valve was made to Joint Army Navy (JAN) specifications and that the manufacturer was National Union (CNU).
Manufactured by National Union Radio Corporation, Orange, NJ, USA.
2.5 V indirectly heated cathode.

Physical Description

Small shouldered bulb (with top cap) on 4 pin UX style base.

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