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VT-256

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ID = 17870
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Magnetron 
Identical to VT-256 = GL486 = 3J26

Filament
Description According to Sibley, this code refers to a magnetron also registered as 3J26 and as GL486. The RMA registration dropped and no data can be found. Sibley also add that it was never found in surplus sales. Probably never produced. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
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