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RAC

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ID = 28735
       
Country:
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  LOCKED OFF TUBE (CODE 9) - see in Notes 
Identical to RAC
First year 1922 Saga of the Vacuumtube, Tyne page 380

Filament
Description maybe an error in Tyne. Should mean R4C instead. 
 

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