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ID = 22221
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
  Late but no serial production. For instance only development samples. *****
Identical to EF4
First Source (s)
Sep.1935 : Philips Bulletin Monatsheft Nr. 29
Predecessor Tubes EF2  
Successor Tubes 1936   EF5  

Base Europe side contact, small P5 (Au V, 5E) Top contact with a cap.
Filament Vf 6.3 Volts / If 0.18 Ampere / Indirect / Specified voltage AC/DC
Description Von Philips im September 1935 vorgestellt, aber nicht in Serie produziert,
mehr unter: September 1935 : die beinahe-schon-Rote-Serie von Philips ! 

ef4_s35_sc.png EF4: Philips Monatsheft 29, September 1935
Jacob Roschy

Just Qvigstad
EF4: Philips Monatsheft 29, September 1935
Jacob Roschy

More ...
Usage in Models 1= 1940?? ; 1= 1946?? ; 1= 1957

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

Collection of



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