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ID = 5812
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Double Triode 
Identical to 407A
Similar Tubes
Different maximum ratings:
Multiple differences or of other kind:

Base Noval, 9 pin miniature (USA pico-9) B9A (Codex=Eo)
Filament Vf 40 Volts / If 0.05 Ampere / Indirect
Description Miniature twin triode, for use in carrier repeater equipment having heaters and plate series supplied through cable pairs. Heater can be connected for 20V, 100mA operation.
GE, RCA, Sylvania, WE known suppliers. 
Text in other languages (may differ)
Tube prices 1 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Tube Lore (I)   

407a_sock.png 407A: Sylvania Data Sheet
Egon Penker

Just Qvigstad
407A: Sylvana Data Sheet
Egon Penker

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Collection of

Documents about this component
  One fascinating application of the 407A as bidirectional line amplifier is given in this article from Electronics, January 1955. The circuit operates, with reduced gain, even in case of a tube failure. 1887 KB


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