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NN

Information - Help 
ID = 28653
       
Country:
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Tube type:  High-vacuum Rectifier 
Identical to NN = 221A

Filament
Description Project coding for 221A. 
Literature Saga of the Vacuumtube, Tyne   page 280
 

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