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ID = 13500
United States of America (USA)
Tube type:  Gas Triode   Detector 
Identical to 200A = UX200A = 00A = TC200A = SX200A = D400A = Detector_Knight = PA200A = BD200A = SLX200A = AX200A = 00AX = MX200A = PD200A = 0200A
Similar Tubes
Normally replaceable-slightly different:
First Source (s)
Apr.1926 : Saga of the Vacuum Tube, Tyne
Predecessor Tubes UX200  

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo)
Filament Vf 5 Volts / If 0.25 Ampere
Information source Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia   
  200A: Internet
Miguel Angel Trujillo-Rodriguez
200A: RMG
Robert Gillespie

More ...
200A: Telefunken Werkstattbuch
Wolfgang Bauer

200A: KoBi
Konrad Birkner † 12.08.2014

More ...

from Just Qvigstad

Usage in Models 1= 1926 ; 2= 1927? ; 2= 1927 ; 1= 1928? ; 3= 1928

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):9

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