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ID = 27512
Great Britain (UK)
Brand: GEC, General Electric Co Ltd., GENALEX; London
Tube type:  TR-switch 
Identical to CV8 = E1248 = E1356

Was used by Radar
Filament Vf 6 Volts / If 4 Ampere / Indirect

See E1248. Microwave Diode switch.
Vacuum diode designed to be used as TR switch in coaxial lines. Cathode was supported by the rod from the top glass dome, while heater came out from the bottom. Anode was a copper block in the middle.
450V peak anode voltage, 30A peak current.
No known use; replaced by gas filled TR switches.

Information source -- Original-techn. papers.   Callick. Metres to Microwaves
-- Original-techn. papers.   

CV8: Manufacturer's Literature
Emilio Ciardiello

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