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ID = 4099
Tube type:  HEPTODE   Frequency converter 
Identical to 1AE5
First Source (s)
27.Jan.1949 : Electron Tube Registration List 732

Base Wires only.
Filament Vf 1.25 Volts / If 0.06 Ampere / Direct / Battery =
Description T2x3 subminiature heptode, designed to be used as mixer with external local oscillator. Six flying leads from flat press base. 
Information source Essential Characteristics, GE 1973   

sockel_6a.png 1AE5: Raytheon Manual
Heinz Höger

1AE5: Essential characteristics
Peter Hoddow

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