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ID = 9252
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Tube type:  Pulse magnetron   UHF 
Identical to 700D
Similar Tubes
Normally replaceable-slightly different:

Was used by Radar
Filament Vf 13.5 Volts / If 1.85 Ampere / Half indirect

External magnet cavity magnetron. 12KV, 10A, 40KW peak pulse. 685MHz +/- 5MHz. Coaxial output.
Can be replaced by the tunable 4J42.

Information source Taschenbuch zum Röhren-Codex 1948/49   
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