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B438

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ID = 2475
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode, vacuum 
  Ca. 1925 up to 1945 rare.
Identical to B438 = W410
Similar Tubes
Normally replaceable-slightly different:
  2-438 ; 4B3_Ultron ; A4_Zenith ; M350S ; M504 ; W420
Other base:
  B438_UX4
First year 1927 Tube leaflet collection E.Erb Analysis by original leaflets
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Battery =
Description

This tube also listed in Babani.

 
Dimensions (WHD)
incl. pins / tip		 45 x 100 x 35 mm / 1.77 x 3.94 x 1.38 inch
Information source L'ABCDaire des lampes de TSF des jeunes années   p. 41
- - Manufacturers Literature   
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49
1_20.png B438: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		b438_spec.png
B438: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector
More ...
Usage in Models 1= 1928?? ; 1= 1930?? ; 2= 1930 ; 2= 1931? ; 7= 1931 ; 1= 1932?? ; 1= 1932 ; 1= 1933? ; 1= 1933 ; 1= 1936?? ; 1= 1937? ; 1= 1938?? ; 1= 1940??
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):21

Collection of

Danko Tkalec (HR)
John Koster (NL)
Ernst Röggla (I)
 
b438.jpg

B438
 
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