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ID = 19455
Tube type:  Signal Diode - one single system   UHF 
Identical to CV58 = E1273 = REL47
Similar Tubes
Normally replaceable-slightly different:

Was used by Radar
Filament Vf 6.3 Volts / If 0.36 Ampere / Half indirect / Specified voltage AC/DC

UHF mixer diode, designed to be used in balanced or coaxial lines up to over than 3GHz (9 cm). 0.05mm anode to cathode spacing.
Available since 1942.

Vacuum diodes and triodes were experimented as mixers in the receivers of the early 10-cm radar sets. Silicon diodes were easily burnt by the high-power pulses of magnetron transmitters, while vacuum devices were capable to withstand energy of RF pulses. Unfortunately they were too noisy and never came out of the experimental stage.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
12 x 44 x 12 mm / 0.47 x 1.73 x 0.47 inch
Information source -- Original prospect or advert   Callick, metres to Microwaves
-- Original-techn. papers.   

CV58: Manufacturer's Literature
Emilio Ciardiello

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