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ID = 4146
Tube type:  Pentagrid-Converter (Heptode) 
Identical to 1E8

Filament Vf 1.25 Volts / If 0.04 Ampere / Direct / Battery =
Tube prices 2 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   

1E8: Internet
Miguel Angel Trujillo-Rodriguez

1e8_sockel.png 1E8: Essential characteristics
Peter Hoddow

1E8: Essential characteristics
Peter Hoddow

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