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M455

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ID = 51401
       
Country:
Netherlands
Brand: Megatron Radio; Hilversum (NL)
Tube type:  Screen-grid Tetrode 
  Ca. 1925 up to 1945 rare.
Identical to M455
Similar Tubes
Normally replaceable-slightly different:
  E455

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 Top contact screw type.
Filament Vf 4 Volts / If 1 Ampere
Description Varitetrode. 
Information source - - Manufacturers Literature   1934
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9_14~~1.png M455: Telefunken Werkstattbuch
Wolfgang Bauer


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