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ID = 28815
United States of America (USA)
Brand: General Electric Co. (GE); Bridgeport CT, Syracuse NY
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
  <1925 rare.
Identical to TB1_Kenotron

Base SPECIAL TUBEBASE in general
Was used by Military and/or Government
Filament Vf 7.5 Volts / If 1.45 Ampere / Direct / Battery =

This Kenotron was utilized to regulate the output voltage of the wind-driven generators used to furnish power to aircraft radio equipment.
Filament voltage range 7.5 to 10.75 V. Va max.= 250 V; Ia max.= 125 mA. Used in WW I aircraft. Special 3-prong Shaw brass-bakelite or brass-ceramic base. About 4500 were delivered to the Signal Corps.
The Term "Kenotron" was chosen for the pure electron-discharge in a two element-tube. The word Kenotron is derived from the Greek "kenos", meaning "empty space" (vacuum), and "tron", used by the Greek to denote an instrument. The TB1 has a unic UV like 3 pin base. The position of the locking key and the filament pins are different from the UV like 3 pin Navy base and the usual UV4 base.

Text in other languages (may differ)
Tube prices 4 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   page 141, 147, 148, 149
70 Years of Radiotubes and V.   
TB1_Kenotron: Private collection
Emilio Ciardiello

More ...
TB1_Kenotron: own collection
Peter den Boer


Documents about this component
  TB1 mounted in wind driven generator 4478 KB

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