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A409

Information - Help 
ID = 2019
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode, vacuum   Universal 
Identical to A409 = PM3X = 1-409 = Spheria
Similar Tubes
Normally replaceable-slightly different:
  407A_Eagle ; 4AF ; 4B06 ; 4B1_Ultron ; 4N08 ; A4 ; C9_Fotos ; Euréka ; G409_Longlife ; H412 ; HX412 ; M300 ; OX49 ; R75 ; RD509 ; S1010 ; TM-DT1 ; UX406 ; V1010
Other base:
  A409_Tfk-4pin ; A409_UX-4pin ; PR48_Condor
First year 1925 -- Collector info (Sammler)
First Source (s)
1924 : Saga of the Vacuumtube, Tyne p.421
22.Jan.1926 : Radio Luistergids, The Netherlands New as replacement for A410 and A406

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.06 Ampere / Direct / Battery =
Description

The German "Codex 1948" lists the A409 as Valvo but it is a Philips and Valvo never produced it.

 
Text in other languages (may differ)
Tube prices 5 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
a409_061r.jpg
A409: Collection JR
Jacob Roschy

 
1_2.png
A409: Telefunken Werkstattbuch
Wolfgang Bauer

 
a409_spec.png
A409: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector


Usage in Models 1= 1924 ; 7= 1925 ; 1= 1926?? ; 10= 1926? ; 25= 1926 ; 4= 1927?? ; 11= 1927? ; 47= 1927 ; 9= 1928?? ; 22= 1928? ; 38= 1928 ; 8= 1929?? ; 2= 1929? ; 24= 1929 ; 5= 1930?? ; 5= 1930? ; 9= 1930 ; 1= 1931? ; 5= 1931 ; 1= 1933 ; 1= 1934 ; 1= 1935?? ; 1= 1935 ; 1= 1941 ; 1= 1944 ; 1= 9999

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):241



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