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PT425

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ID = 11563
       
Country:
Great Britain (UK)
Brand:
Tube type:  Vacuum Pentode   Power/Output 
Identical to PT425
Similar Tubes
Normally replaceable-slightly different:
  D100 ; D60
First Source (s)
1929 : Saga of the Vacuum Tube, Tyne p.386
Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Foo) Sidecontact.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.25 Ampere / Direct / Specified voltage AC/DC
Information source Taschenbuch zum Röhren-Codex 1948/49   
History of the British Radio Valve to 1940   P. 162, 164 & 185
b4_base_pins~~389.png PT425: Fin Stewart
Fin Stewart

Just Qvigstad 		pt425_data.png
PT425: MARCONI VALVES MANUAL
Jose Casas-Avalos
More ...
Usage in Models 2= 1929 ; 1= 1930 ; 3= 1931 ; 9= 1932 ; 1= 1933 ; 1= 1934
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):17

Collection of

Christian ADAM (F)
Raynal Aufils (F)
Etienne Flemal (B)
Peter Pfeiffer (D)
 
gecpt4252_web.jpg

PT425
 
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