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ID = 9244
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: Western Electric Company Inc.; New York (NY) 
Tube type:  Pulse magnetron 
Identical to 4J30
Similar Tubes
Multiple differences or of other kind:

Was used by Radar
Filament Vf 23.5 Volts / If 2 Ampere / Half indirect

Fixed frequency L-band magnetron of the 4J21 family. Forced air cooling. 27KV at 46A; 600KW on coaxial output. 4J30 operates at 1226MHz.

Information source Taschenbuch zum Röhren-Codex 1948/49   
Tube Lore (I)   

4J30: Manufacturer's Literature
Emilio Ciardiello

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