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ID = 30265
Brand: Cyrnos (brand) - see also MCB
Tube type:  Dual-Grid Tetrode   Frequency converter 
Identical to CI441
Similar Tubes
Normally replaceable-slightly different:
  41MDG ; E441N

Base Europe 5-Pin (O5A, B5) Sidecontact
Filament Vf 4 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)
Literature Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia   
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