Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 2919
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 =

"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
P420: own collection
Peter den Boer

Usage in Models 1= 1927?? ; 1= 1931 ; 1= 1934? ; 1= 1937 ; 1= 1938

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):5

Collection of



You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]

Data Compliance More Information