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ID = 525
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Vacuum Pentode   Universal 
Identical to EF1 = TEF1 = VF1 = VEF1
Similar Tubes
Heater different:
First year Mar.1934 Tube leaflet collection E.Erb Analysis by original leaflets (Bulletin D13)
First Source (s)
Mar.1934 : Philips Bulletin #D13
Successor Tubes EF7  

Base Europe side contact P8A (Au P, 8SC) (Codex=Sf) Top contact with a cap.
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). 
Tube prices 1 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   

EF1: ficha de valvulas
Getulio Jimenez-Gomez

28_8~~1.png EF1: Telefunken Werkstattbuch
Wolfgang Bauer

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Just Qvigstad
EF1: Telefunken 1935
Robert Schmalstieg

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Usage in Models 3= 1934 ; 5= 1935 ; 2= 1936? ; 6= 1936 ; 2= 1938 ; 1= 1946 ; 1= 1947 ; 1= 1948

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):21

Collection of



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