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ID = 68535
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Half-Wave Rectifier, gasfilled   Power-supply 
  Ca. 1925 up to 1945 very rare. ***
Identical to 68502

Base Edison big E27 = 27 mm
Was used by Industrial
Filament Direct / Specified voltage AC/DC

This tube is one of a series of tubes made by the British Thomson Houston/Ediswan companies (after their merger in 1927) with the type number prefix 68----. Manufacturers literature indicates that the companies were licensed by the General Electric Company (USA) to use the name "Tungar" to identify the type of rectifier tubes These are. primarily battery or accumuator types. The output of this tube for charging is1 amp and the anode is the skirted insulated section of the base, between the thread and the glass..

Information source - - Manufacturers Literature   

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