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ID = 28775
United States of America (USA)
Brand: DeForest-Tubes
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to S_deForest
First year 1917 ?? Saga of the Vacuum Tube, Tyne page 115, 16, 117

Base Edison (candelabra) 12 mm
Was used by Radio/TV-reception etc.
Filament Direct / Battery =

Used in the "Oscillion S", a panel holding the Audion and fitted with controls and terminals. Oscillion was chosen for Audions able to oscillate. de Forest also used three of these tubes in a very early version of an electronic organ. The tube illustrated has the Screw part of the E12 base unfortunately broken off. Later versions of the tube were fitted with a standard 4 pin "UV" base.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
59 x 102 x mm / 2.32 x 4.02 x inch
Weight 47 g / 1.66 oz
Information source Saga of the Vacuum Tube, Tyne   Pages 114 - 116

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