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ID = 2730
Tube type:  Triode-Hexode   Frequency converter 
Identical to 7J7E
First Source (s)
12.Jul.1939 : Electron Tube Registration List rec. 202
Predecessor Tubes 6J8G   6K8GT  
Successor Tubes 7J7  

Base Loctal-8, B8G (Sylvania, 1938)
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC

Actually this code just identifies the early production of 7J7 by Philco. First registered in 1939 as triode-hexode, was re-registered to Sylvania Hygrade in June 1942, with the addition of a suppressor grid internally connected to cathode.
See also 7J7.


Just Qvigstad
7J7E: Manufacturer's Literature
Emilio Ciardiello

More ...
Usage in Models 2= 1941 ; 1= 1942 ; 2= 1946 ; 1= 1948

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):6

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