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ID = 3615
United States of America (USA)
Developer: Westinghouse El. & Mfg. Co. - see also Canadian W. 
Tube type:  Triode, vacuum   Universal 
Identical to WD11 = 11 = C11 = SLD11
Similar Tubes
Normally replaceable-slightly different:
  M.D.3A ; M11
Other base:
  12 ; DE11 ; WD12 ; WX12
Differences not known by us:
First year Jan.1922 Saga of the Vacuum Tube, Tyne page 310
First Source (s)
Jan.1922 : Saga of the Vacuum Tube, Tyne
Predecessor Tubes T88_Westinghouse  
Successor Tubes 1923   WD12   WX12   864  

Base WD-base (Codex=Bw)
Filament Vf 1.1 Volts / If 0.25 Ampere / Direct / Battery =

Work on this tube started at the Westinghouse laboratories in Bloomfield, New Jersey in mid to late 1921. It was designed for use as a detector in the Westinghouse Aeriola Senior radio. This set was announced in the RCA catalog "Radio Enters The Home" published June 22nd, 1922.


Oxide coated, first without getter then lime-getter. First form with a brass base (BB) with tip. Second has bakelite base and is smaller, tipped. Third version is bakelite, no tipp, clear. Then bakelite, no tip but opaque getter (not clear). The last verion of this tube had silvered gettering. Plate has a bigger diameter at the base. It was made by a few of the major manufacturers in the US, Mullard in England (M.D.3A)and Philips in Holland listed the base as available. It is not known what type number was used for the Philips tube. .

Text in other languages (may differ)
Tube prices 68 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   
Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature
-- Collector info (Sammler)
  WD11: RCA
Anonymous 56 Collector
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Geri Meier

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WD11: KoBi
Konrad Birkner † 12.08.2014

WD11: KoBi
Konrad Birkner † 12.08.2014

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from Just Qvigstad

Usage in Models 1= 1921 ; 4= 1922? ; 13= 1922 ; 1= 1923? ; 22= 1923 ; 11= 1924

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):52

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