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ID = 68446
United States of America (USA)
Brand: WLS (tubes), World's Largest Store - see also Sears, Roebuck & Co; Chicago, IL
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Half-Wave Mercury-Vapor Rectifier   Power-supply 
  Ca. 1925 up to 1945 rare.
Identical to 57T5302
Similar Tubes
Normally replaceable-slightly different:

Base Edison giant, E40 = 40 mm-Goliat Other combinations of connections.
Filament Vf 2.2 Volts / If 17.5 Ampere / Direct / Specified voltage AC/DC

This tube is listed on page 762 of the Fall 1929m issue of the Sears Roebuck catalog, along with a range of Silvertone receiving tubes. It is a quick starting half wave rectifier type suitable for charging accumulators. It was widely used for carging 6 volt car batteries, A radio batteries and a wide range of other applications. The tube is rated at a maximum average anode current of 5 to 6 amps. The anode is from a strong wire lead at the top of the bulb. The later GE equivalent is the 99X44 and the tube was made by many manufacturers, both in the US and Europe.

Information source Sears, Roebuck Catalogs (Silvertone)   Fall 1929 issue - pages 762 and 763
- - Manufacturers Literature   
-- Collector info (Sammler)

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