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EF3

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ID = 3474
       
Country:
Europe
Brand: Common type Europe tube/semicond.
Developer: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH 
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to EF3
Similar Tubes
Heater different:
  CF3 ; EF9nT ; VF3
First year Jul.1936 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
Feb.1936 : Funkschau 1936, # 5
Jan.1936 : Fortschritte der Funktechnik und ihrer Grenzgebiete (8 Bände) 1936 # 1
Predecessor Tubes EF2  
Successor Tubes EF5  

Base Europe side contact base P (P8A) (Codex=Sf) Top contact with a cap
Filament Vf 6.3 Volts / If 0.24 Ampere / Indirect / Parallel, (AC/DC)
Description Nachzügler zur ersten europäischen Serie von Autoradioröhren. Die EF3 ist die ZF- Regelröhre. 
Tube prices 1 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
d_telefunken_ef3_alt.jpg
EF3: TreLe
Trev Levick

 
28_7.png
EF3: Telefunken Werkstattbuch
Wolfgang Bauer

 
ef3_data1.png
EF3: Telefunken 1937
Robert Schmalstieg


Usage in Models 3= 1936 ; 1= 1938 ; 1= 1939?? ; 1= 1945?? ; 1= 1948??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):7


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