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NR31

Information - Help 
ID = 14556
       
Country:
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Triode, vacuum   Detector 
  Ca. 1925 up to 1945 very rare. ***
Identical to NR31 = CV399 = VR37 = CV1037 = 10E/9598 = AR17 = 7413 = VT139_GPO
Similar Tubes
Normally replaceable-slightly different:
  MH4

Base Europe 5-Pin (O5A, B5) (Codex=F)
Was used by Military and/or Government
Filament Vf 4 Volts / If 1 Ampere / Indirect / Parallel / series AC/DC
Description

Metalised body.

 
Literature Taschenbuch zum Röhren-Codex 1948/49   
-- Original-techn. papers.   
-- Collector info (Sammler)
 
nr_31.jpg
NR31: DE MI COLECION
Justo Puertas-Paule

 
nr31_so.png
NR31: rtt
Michael Schlör

 
cv399nr31_1.png
NR31: Manufacturer's Literature
Emilio Ciardiello



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