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ID = 25445
United States of America (USA)
Tube type:  Gas Triode   Detector 
Identical to SX200A = UX200A = D400A = 00A = TC200A = 200A = 5VD_vanHorne
First year May.1926 Radios von gestern, 2. Auflage + Tyne page 316
First Source (s)
Apr.1926 : Saga of the Vacuum Tube, Tyne

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery =
Description In 1925 (Stokes page 17) RCA replaces the UV200 with the UX200.
Tyne: In May 1926 RCA announces the UX200A as a new detector tube, replacing the UX200. The UX200A contains caesium vapor isntead of argon gas of the UV200 and UX200 to get a much more stable operation and increase of sensitivity. The UX200A has a thoriated filament but at that time, 1926, was already outdated and only being used as replacement for UX200 (EE). 
Text in other languages (may differ)
Information source -- Collector info (Sammler)   
Babani, International Radio Tube Encyclopaedia   
SX200A: Bill Condon collection, with kind permission of Mrs V Condon
Fin Stewart

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SX200A: Fin Stewart
Fin Stewart

SX200A: Vintage Electronic catalog
Geri Meier

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