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ID = 1740
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to AF2 = TF2 = VAF2
Similar Tubes
Other characteristic (electr. data):
  E447 ; M447 ; RENS1294 ; WE25
Other base:
First year Mar.1933 Tube leaflet collection E.Erb 1934 - but Model in NL 1933!
First Source (s)
Mar.1934 : Philips Bulletin #D13
Mar.1934 : L'Histoire Singulière du Tube Radio; G. Duperray 2009
Predecessor Tubes E447  
Successor Tubes 1935   AF3  

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Fco) Top contact screw type.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.1 Ampere / Indirect / Parallel, (AC/DC defined voltage)

Since different radio models from 1933 show an AF2 in the papers, we list the AF2 as first series in 1933. Fact is that the AF2 was announced in Spring 1934 but its predecessor, E447 was in those sets from 1933. Only few people know and we would have too many reports saying the tube is of 1933 if we would put it correctly to 1934.

Text in other languages (may differ)
Tube prices 4 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   Design = Philips
  AF2: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
AF2: Collection JR
Jacob Roschy

AF2: Telefunken Werkstattbuch
Wolfgang Bauer

AF2: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

from Just Qvigstad

Usage in Models 2= 1933? ; 3= 1933 ; 15= 1934? ; 117= 1934 ; 2= 1935?? ; 29= 1935? ; 133= 1935 ; 3= 1936? ; 24= 1936 ; 2= 1937? ; 3= 1937 ; 1= 1938?? ; 2= 9999

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):336

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