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A425

Information - Help 
ID = 2453
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode, vacuum   Universal 
  Ca. 1925 up to 1945 rare.
Identical to A425 = RE034 = A22 = PM3DX
Similar Tubes
Normally replaceable-slightly different:
  1-425 ; 407W ; 410HF ; 410RC ; 4AAF1 ; 4AFF1 ; 4B3_Ultron ; AF_Castilla ; C25 ; D502 ; DT4_Triode ; G425_Longlife ; H4 ; L307 ; M350 ; OX254 ; RO4125 ; V3030 ; W4 ; W412
Other base:
  A425_UX
First year 1926 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
1925 : Saga of the Vacuum Tube, Tyne p.421

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Filament Vf 4 Volts / If 0.06 Ampere / Direct / Battery =
Description Also available with UX4 base. 
Tube prices 1 Tube prices (visible for members only)
Information source Babani, International Radio Tube Encyclopaedia   
Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature
 
a425~~1.jpg
A425: eigene Sammlung HV
Hartmut Völler

 
1_10.png
A425: Telefunken Werkstattbuch
Wolfgang Bauer

 
a425_spec.png
A425: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector


from Just Qvigstad

Usage in Models 1= 1926? ; 8= 1926 ; 3= 1927?? ; 5= 1927? ; 23= 1927 ; 3= 1928?? ; 4= 1928? ; 27= 1928 ; 4= 1929?? ; 5= 1929? ; 27= 1929 ; 2= 1930?? ; 3= 1930? ; 24= 1930 ; 2= 1931? ; 7= 1931 ; 5= 1932 ; 1= 1939

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):154


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