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ID = 4394
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Vacuum Pentode   Power/Output 
Identical to 3W4 = 3S4SF
First year 11.Jun.1956 Electron Tube Registration List

Base Miniatur-7-Pin-Base B7G, USA 1940
Was used by Radio/TV-reception etc.
Filament Vf 2.8 Volts / If 0.025 Ampere / Direct / Battery =

Heizdaten alternativ: Uf=1,4V; If=0,05A.

Information source Essential Characteristics, GE 1973   

3w4_sockel.png 3W4: Essential characteristics
Peter Hoddow

Just Qvigstad
3W4: Essential characteristics
Peter Hoddow

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