Summary

High voltage rectifier diode. 4 volt directly heated cathode.
CV Code XB indicates February 1966 and code F indicates the manufacturer was STC Paignton works. The inscription U27 is an equivalent type. It is also equivalent to the Brimar R11.
Manufacturer: STC, Paignton, England

Physical Description

Shouldered glass bulb on 4 pin European style base.

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