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WR

Information - Help 
ID = 28916
       
Country:
Great Britain (UK)
Brand: Cossor, A.C.; London
Tube type:  LOCKED OFF TUBE (CODE 9) - see in Notes 
Identical to WR
First year May.1925 Saga of the Vacuumtube, Tyne page 375

Filament
Description only in Tyne p.375. WR1 and WR2 are known. WR may be a common naming for the special filament arrangement: An 8 ohm series resistor allowed to operate from 4 to 6 volt supply; if shortened by a thumbscrew the tube could be used with 2 volt L.T.

See WR1 and WR2 
 

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