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ID = 4991
Tube type:  Triode, vacuum   UHF 
Identical to 6K4_USA = SD-834
Similar Tubes
Different connections:
  5897 ; 5977 ; 6778
Other base and data slightly different:
First Source (s)
23.Nov.1945 : Electron Tube Registration List
Successor Tubes 5703   5977   6946   5897  

Base Wires Wires only.
Filament Vf 6.3 Volts / If 0.15 Ampere / Indirect

Subminiature triode with T3 subminiature bulb; 5 flying wires from the base. As oscillator operates up to 1.5GHz.

Tube prices 1 Tube prices (visible for members only)
Information source - - Manufacturers Literature   
Tube Lore (I)   

6k4_sockel.png 6K4_USA: Essential characteristics
Peter Hoddow

6K4_USA: Sylvania Manual
Heinz Höger

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