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ID = 28521
United States of America (USA)
Brand: DeForest-Tubes
Developer: DeForest-Tubes 
Tube type:  Triode, vacuum   Detector 
  Ca. 1925 up to 1945 rare.
Identical to DL15_deForest
Similar Tubes
Normally replaceable-slightly different:
First year 1927 ?? Saga of the Vacuum Tube, Tyne Seite 301

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery =

Plate voltage 45. This tube had an alkali gettering on the inside of the glass bulb. This could have been cesium. The grid was connected to the filament. The tube was fitted with an "Isolantite" base (a type of ceramic). First made 1927, it was discontinued in 1928.

Dimensions (WHD)
incl. pins / tip
34 x 107 x mm / 1.34 x 4.21 x inch
Literature Saga of the Vacuum Tube, Tyne   Pages 301 @ 302
-- Collector info (Sammler)   
DL15_deForest: R.O.
Rudolf Osterkamp

DL15_deForest: Fin Stewart
Fin Stewart


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