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ID = 28530
United States of America (USA)
Brand: DeForest-Tubes
Developer: DeForest-Tubes 
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 very rare. ***
Identical to DV7
First year 1927 ?? Saga of the Vacuum Tube, Tyne Seite 301
First Source (s)
1926 : Saga of the Vacuum Tube, Tyne p.301

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.5 Ampere / Direct / Battery =

Tube designed as "Last Audio Stage " output type and first made 1926

Dimensions (WHD)
incl. pins / tip
35 x 106 x mm / 1.38 x 4.17 x inch
Tube prices 1 Tube prices (visible for members only)
DV7: eigene Sammlung
Gerhard Eisenbarth

DV7: Fin Stewart
Fin Stewart


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