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A442

Information - Help 
ID = 2457
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Screen-grid Tetrode   VHF 
  Ca. 1925 up to 1945 rare.
Identical to A442
Similar Tubes
Normally replaceable-slightly different:
  410SG ; 4B6_Ultron ; A2004 ; A442K ; C150 ; DS1 ; L409 ; OX304 ; R81Ecran ; RO4142 ; S4 ; VH300
Other base:
  A442_UX4
First year 1927 Tube leaflet collection E.Erb Analysis by original leaflets
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Er) Top contact screw type.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.06 Ampere / Direct / Battery =
Description Also made with UX4 base. 
Dimensions (WHD)
incl. pins / tip		 45 x 125 x 35 mm / 1.77 x 4.92 x 1.38 inch
Weight 58 g / 2.05 oz
Information source - - Manufacturers Literature   
Taschenbuch zum Röhren-Codex 1948/49   
  a442.png
  A442: OWN COLLECTION
Loris Bugamelli
 
a442.png
A442: R.O.
Rudolf Osterkamp
More ...
 
3_1.png
A442: Telefunken Werkstattbuch
Wolfgang Bauer
 
a442_spec.png
A442: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector
More ...

from Just Qvigstad
Usage in Models 3= 1927?? ; 2= 1927? ; 8= 1927 ; 1= 1928?? ; 14= 1928? ; 17= 1928 ; 5= 1929?? ; 1= 1929? ; 16= 1929 ; 4= 1930?? ; 2= 1930? ; 35= 1930 ; 8= 1931 ; 6= 1932 ; 1= 1933? ; 2= 1933 ; 1= 1934 ; 1= 1940??
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):127
Museum "Technik-Museum.ch"
Collection of Hartmut Völler (D)
Collection of Thomas Lebeth (A)
Collection of Patrice Zeissloff (F)
Collection of Rudolf Osterkamp (D)
Collection of Wolfgang Bauer (A)
Collection of Christian ADAM (F)
Collection of John Koster (NL)
Collection of Francisc VISKY (RO)
Collection of Andreas Schulz (D)
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