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ID = 20981
Brand: Triotron (tubes) = Brand of Schrack, Austria
Developer: Triotron (tubes) = Brand of Schrack, Austria 
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
  Ca. 1925 up to 1945 rare.
Identical to G4120_Triotron
Similar Tubes
Normally replaceable-slightly different:
  1561 ; G2004 ; G4200 ; PV4 ; PV4200 ; PV4300 ; RGN2004

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 2 Ampere / Direct / Specified voltage AC/DC
Dimensions (WHD)
incl. pins / tip
54 x 143 x 35 mm / 2.13 x 5.63 x 1.38 inch
Information source - - Manufacturers Literature   1935
Babani, International Radio Tube Encyclopaedia   p. 267 & 279
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

g4120triotron_so.png G4120_Triotron: rtt
Anonymous 10 Collector

Just Qvigstad
G4120_Triotron: own collection
Peter den Boer

Collection of



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