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ID = 20358
Brand: Helikon, Helikonwerk, Ing. Richard Martinek; Wien
Tube type:  Triode, vacuum 
  Ca. 1925 up to 1945 rare.
Identical to W306_Helikon

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 3 Volts / If 0.06 Ampere / Direct / Battery =
W306_Helikon: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

W306_Helikon: Helikon Röhrenbroschüre ca. 1927
Thomas Lebeth

from Just Qvigstad

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