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4DR

Information - Help 
ID = 12339
       
Country:
Spain
Brand: Castilla; Madrid
Tube type:  Space Charge Tetrode 
Identical to 4DR
Similar Tubes
Other characteristic (electr. data):
  A441N

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eu) Sidecontact.
Filament Vf 4 Volts / If 0.08 Ampere / Direct / Battery =
Information source Taschenbuch zum Röhren-Codex 1948/49   
 
4dr_so.png
4DR: rtt
Michael Schlör

 
4dr_spec.png
4DR: Castilla 1930
Anonymous 15 Collector


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