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ID = 82802
United States of America (USA)
Brand: Marconi Wireless Telegraph Co. of America
Developer: Fleming - valves; GB 
Tube type:  Signal Diode - one single system   Detector 
Identical to Fleming-US_B22

Base Swan-Bajonett B22=22 mm
Was used by Radio/TV-reception etc.
Filament Direct / Battery =

A series of Fleming valves were made in the US for the Marconi  Wireless Telephone Co. of America. These all had B22 bayonet bases and a "flying lead" for the anode. The anode of these tubes was triangular in most cases and the top was cut off. Two basic bulb styles were used: 1) S14  cone shaped and 2) T8 or T10 size, tubular. A number of these tubes have been located. The illustration on page 48 of Tyne also shows another American made Fleming valve with a small brass cap for the anode connection instead of the usual "flying lead" One of these tubes is pictured on page 14 of George Greenwood's book "A pictorial Album of Wireless and Radio 1905 - 1928" published in 1961. This book was later revised and reprinted by Morgan McMahon c. 1980's and the photo is in it.

Information source Saga of the Vacuum Tube, Tyne   p. 47 & 48
Fleming-US_B22: Howard Stone and the Stone Vintage Radio Museum
Fin Stewart


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