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The CV specification refers to the CV253 as a crystal valve - a semiconductor diode. These early radar detectors were point contact types. The CV253 was designed to work at 6-12 GHz and worked directly within the incoming waveguide.
The jar was sealed with an evil smelling wax that was removed with the aid of hot water.
The jar was sealed in November 1945.
The six diodes within the jar. A cotton wool plug held them in place. At the top was a leaflet.
A diode within in the protective metal can. These diodes are very sensitive to static and the can kept the two ends shorted together.
The top of the shorting can with the diode protruding through.
The enclosed leaflet.
The lead protection had to be pealed off to release the diode.
The diode itself.
The diode would be inserted through the walls of the waveguide and into the far wall.
The containing glass jar is 31 mm in diameter and is 47 mm tall.
Reference: Data-sheet.


Absolute Maximum Operating Conditions
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated June 22, 2021.
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