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ID = 61383
Tube type:  Gas Triode   Detector 
Identical to 200X00-A = 00A = UX200A

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Filament Vf 5 Volts / If 0.25 Ampere / Direct

An equivalent of UX200A/00A gas detector.

ERLA tubes were advertised in 1926 by Electrical Reserach Laboratories, 2500 Cottage Grove Avenue, Chicago, Illinois.

Information source Saga of the Vacuum Tube, Tyne   
200X00-A: collezione privata
Davide Casarosa

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