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ID = 4407
Tube type:  Double Pentode 
Identical to 4BU8 = 4GS8
Similar Tubes
Heater different:
  3BU8 ; 3GS8 ; 6BU8

Base Noval, 9 pin miniature (USA pico-9) B9A
Filament Vf 4.2 Volts / If 0.45 Ampere / Indirect
Tube prices 2 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
4BU8: GP
George Papaiz

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4BU8: RTT Schwandt
Günther Stabe † 19.8.20

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4BU8: RCA Tube Manual
Peter Hoddow

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from Just Qvigstad

Usage in Models 3= 1956? ; 6= 1957? ; 1= 1957 ; 14= 1958?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):24

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