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ID = 24958
Brand: Triotron (tubes) = Brand of Schrack, Austria
Tube type:  Current Regulator, Iron in Hydrogen   Power-supply 
Identical to V80_Ballast
Similar Tubes
Normally replaceable-slightly different:
  1911 ; 4602 ; GRD2 ; GRDII ; Wi150

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament If 0.15 Ampere / Specified current AC/DC ~ = (Series working)

I quer = 0.15 A
U max = 70 V

Information source Ballast Tube Handbook, The   
Röhren-Vademecum; P.H. Brans; Antwerpen   1946

v80_ballast_so.png V80_Ballast: Valvo Röhrentaschenbuch 1957
Anonymous 10 Collector

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