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EF2

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ID = 523
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to EF2 = TEF2 = VEF2 = VF2
Similar Tubes
Other characteristic (electr. data):
  EF2S
Heater different:
  CF2
First year Mar.1934 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
Mar.1934 : Philips Bulletin #D13
Successor Tubes EF3   EF4  

Base Europe side contact base P (P8A) (Codex=Sf)
Filament Vf 6.3 Volts / If 0.4 Ampere / Indirect / Parallel, (AC/DC)
Description Erste Autoradio-Serie in Europa. Philips ab 1934 genannt (März, Philips Bulletin). 
Literature Taschenbuch zum Röhren-Codex 1948/49   
  ef2.png
  EF2: Internet
Miguel Angel Trujillo-Rodriguez
 
ef2_692.jpg
EF2: Collection JR
Jacob Roschy

 
28_6.png
EF2: Telefunken Werkstattbuch
Wolfgang Bauer

 
ef2_tech.png
EF2: Valvo Röhrendatenblatt
Martin Steyer


Usage in Models 3= 1934 ; 5= 1935 ; 2= 1936? ; 6= 1936 ; 1= 1944?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):17



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