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ID = 28717
United States of America (USA)
Brand: DeForest-Tubes
Tube type:  LOCKED OFF TUBE (CODE 9) - see in Notes 
Identical to R_deForest
First year 1927 ?? Saga of the Vacuumtube, Tyne page 301

Description see RO 

You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]