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ID = 28489
United States of America (USA)
Brand: DeForest-Tubes
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Triode, vacuum   Detector 
  Ca. 1925 up to 1945 rare.
Identical to D-01A = D401A
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 =

The first deviation by the de Forest company to make equivalent tubes to the RCA tyles, the D-01A was a direct equivalent of the UX 201A. It was fitted with the "isolantite" base ( a type of ceramic and was introduced in 1927. It was replaced by the D401A in 1928.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
45 x 112 x mm / 1.77 x 4.41 x inch
Weight 64 g / 2.26 oz
Tube prices 6 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   Pages 301 & 302
70 Years of Radiotubes and V.   Page 166
D-01A: O.F.
Otto Frosinn

D-01A: O.F.
Otto Frosinn


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