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ID = 523
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):
Heater different:
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 P8A (Au P, 8SC) (Codex=Sf)
Filament Vf 6.3 Volts / If 0.4 Ampere / Indirect / Specified voltage AC/DC
Description Erste Autoradio-Serie in Europa. Philips ab 1934 genannt (März, Philips Bulletin). 
Information source Taschenbuch zum Röhren-Codex 1948/49   

EF2: Internet
Miguel Angel Trujillo-Rodriguez

28_6.png EF2: Telefunken Werkstattbuch
Wolfgang Bauer

More ...

Just Qvigstad
EF2: Valvo Röhrendatenblatt
Martin Steyer

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

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

Collection of



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