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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 P8A (Au P, 8SC) (Codex=Sf)
Filament Vf 6.3 Volts / If 0.24 Ampere / Indirect / Specified voltage AC/DC
Description Nachzügler zur ersten europäischen Serie von Autoradioröhren. Die EF7 ist im Gegensatz zur EF3 die Linearröhre für die NF-Vorstufe. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
ef3_ef7~~1.png
EF7: schaltplans.
Egon Strampe
28_8.png EF7: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		ef7_data1.png
EF7: Telefunken 1936
Robert Schmalstieg
More ...
Usage in Models 1= 1936
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1

Collection of

Jacob Roschy (D)
Tomasz Szczesniak (PL)
Michael Gnaedig-Fischer (MEX)
Danko Tkalec (HR)
Alexander Hofer (A)
Stefan Müller (D)
Gerhard Eisenbarth (D)
 
ef71.jpg

EF7
 
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