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P420

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ID = 2919
       
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 P420 = RES174d
Similar Tubes
Normally replaceable-slightly different:
  L415D ; L43
Other base:
  P420_5pin ; PP415
Base Europe 4-Pin B4 + side contact (Codex=Foo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.15 Ampere / Direct / Battery =
Description

"Undistorted output 950mW" Advertisement December 2nd 1931

 
Information source - - Manufacturers Literature   1935
Taschenbuch zum Röhren-Codex 1948/49   
Wireless World (The), London (WW, 79)
p420_so.png P420: rtt
Anonymous 10 Collector

Just Qvigstad 		p420data_1.png
P420: own collection
Peter den Boer
Usage in Models 1= 1927?? ; 1= 1931 ; 1= 1934? ; 1= 1937 ; 1= 1938
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):5

Collection of

Etienne Flemal (B)
 
p420_triotron_lmp.jpg

P420
 
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