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P440

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ID = 11423
       
Country:
Austria
Brand: Triotron (tubes) = Brand of Schrack, Austria
Developer: Triotron (tubes) = Brand of Schrack, Austria 
Tube type:  Vacuum Pentode   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to P440
Similar Tubes
Normally replaceable-slightly different:
  F443

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Foo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 2 Ampere / Indirect
Description

"Undistorted output 8000mW" Advertisement December 2nd 1931

 
Information source Babani, International Radio Tube Encyclopaedia   p. 124 & 125
- - Manufacturers Literature   1931 Advertisement in wireless world
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

4_33.png P440: Telefunken Werkstattbuch
Wolfgang Bauer


Just Qvigstad
p440data.png
P440: own collection
Peter den Boer

 

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