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7021

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ID = 18098
       
Country:
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Developer: Osram-Valves GB (not MO-Valves) 
Tube type:  Current Regulator, Iron in Hydrogen   Power-supply 
Identical to 7021 = NS3 = CV1200
Similar Tubes
Normally replaceable-slightly different:
  202_Marconi

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=E)
Filament
Description 200mA stabilized at 120 to 200V.
British Admiralty store reference for NS3/CV1200 ballast. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
-- Original-techn. papers.   


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