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Information - Help 
ID = 28906
United States of America (USA)
Brand: DeForest-Tubes
Tube type:  Triode, vacuum   Universal 
Identical to VT-21
First year 1917 ?? Saga of the Vacuum Tube, Tyne page 120, 122, 131

Was used by Radio/TV-reception etc.
Filament If 1.1 Ampere
Tube prices 2 Tube prices (visible for members only)
VT-21: RMG
Robert Gillespie


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