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E220B

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ID = 14172
       
Country:
Austria
Brand: Triotron (tubes) = Brand of Schrack, Austria
Developer: Triotron (tubes) = Brand of Schrack, Austria 
Tube type:  Double Triode   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to E220B
First Source (s)
22.Nov.1935 : Wireless World (The), London (WW, 79)
Base Europe 7-Pin C7A (Hx C, C7, C) 1933 (Codex=Ls)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.3 Ampere / Direct / Battery =
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   1935
Babani, International Radio Tube Encyclopaedia
e220b_so.png E220B: ARL 1947
Anonymous 10 Collector

Just Qvigstad 		e220bdata.png
E220B: own collection
Peter den Boer
Usage in Models 1= 1935 ; 1= 1936 ; 1= 1937?
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):3
 
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