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ID = 35210
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Transmitter Triode, liquid-cooling 
Identical to 220B_XMIT
Similar Tubes
Normally replaceable-slightly different:
Predecessor Tubes 220A  
Successor Tubes 220C  

Filament Vf 21.5 Volts / If 41 Ampere / Direct
Description Pure tungsten filament; water cooled via external jacket. 10KV, 3MHz full ratings, Mu 40, 10KW.
Federal and WE known manufacturers. 
Information source Tube Lore (I)   
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220B_XMIT: Manufacturer's Literature
Emilio Ciardiello

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