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PX4

Information - Help 
ID = 2787
       
Country:  Great Britain (UK)      Brand: Marconi-Osram - (Valves/Tubes); GB
  Developer:  Marconi-Osram - (Valves/Tubes); GB 
  Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to PX4 = ACPX4a = LP4_Ferranti = VT131_GPO
Similar Tubes Normally replaceable-slightly different:
 CV1168; F5; P10; P12/250; S30C
Other base and data slightly different:
 PX4_UX
Multiple differences or of other kind:
 HP501
First Source (s) 1929 : The Saga of Marconi Osram Valve – (B Vyse and G Jessop 2000)

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Direct / Parallel, (AC/DC) /
Description

Initially mainly used in battery sets, it was later widely used in mains equipment and amplifiers. It went through several stages of development over 3 decades from the starting date of 1929 and is found in balloon, ST and straight envelopes.
The early versions had a maximum anode rating of 200 volts and 40mA with a filament current of 0.6A. From 1937 as it became used less in battery sets, the anode rating was increased to 300 volts and 50mA enabling a 3.5W power output instead of the 1W of the 1929 version; the filament current being increased to 1A to accommodate this increased power.

 
Dimensions (WHD)
incl. pins / tip
61 x 150 x mm / 2.40 x 5.91 x inch
Tube prices 2 Tube prices (visible for members only)
Literature - - Manufacturers Literature   
Taschenbuch zum Röhren-Codex 1948/49   

  px4_app.png
  PX4: GEC's catalogue supplement
Anonymous 413 Collector
gb_marconi_px4.jpg
PX4: Marconi PX4
Howard Craven

 
1_113.png
PX4: Telefunken Werkstattbuch
Wolfgang Bauer

 
px.4_osram.png
PX4: osram wireless guide 1931
Giuseppe Antonio Tusini


Usage in Models 4= 1930 ; 1= 1931? ; 4= 1931 ; 1= 1932? ; 11= 1932 ; 3= 1933 ; 14= 1934 ; 1= 1935 ; 2= 1937 ; 5= 1945? ; 1= 1946 ; 1= 1947 ; 1= 1948 ; 1= 1949
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):50

PX4*Box
   

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