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EF7

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ID = 2343
       
Country:
Europe
Brand: Common type Europe tube/semicond.
Developer: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH 
Tube type:  Vacuum Pentode   Universal 
Identical to EF7
Similar Tubes
Heater different:
  AF7 ; CF7 ; VF7
First year Jul.1936 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
Feb.1936 : Funkschau 1936, Heft 5
Jan.1936 : Funk 1936 # 1
Predecessor Tubes EF1  
Successor Tubes EF6  

Base Europe side contact base P (P8A) (Codex=Sf)
Filament Vf 6.3 Volts / If 0.24 Ampere / Indirect / Parallel, (AC/DC)
Description Nachzügler zur ersten europäischen Serie von Autoradioröhren. Die EF7 ist im Gegensatz zur EF3 die Linearröhre für die NF-Vorstufe. 
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
ef71.jpg
EF7: gerd.eisenbarth
Gerhard Eisenbarth

 
28_8.png
EF7: Telefunken Werkstattbuch
Wolfgang Bauer

 
ef7_data1.png
EF7: Telefunken 1936
Robert Schmalstieg


Usage in Models 1= 1936

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1


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