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ID = 28461
Tube type:  TR-switch 
Identical to CV239
Similar Tubes
Normally replaceable-slightly different:

Base Top contact with a cap.
Was used by Radar
Filament No heater

TR tube, 3000 to 3124MHz, 350V min. keep-alive voltage at 0.1mA.
Similar to CV59 with increased pressure of gas filling.

Information source -- Original-techn. papers.   
CV239: Private collection
Emilio Ciardiello

CV239: Manufacturer's Literature
Emilio Ciardiello

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