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ID = 68444
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 Vacuum Rectifier   Text 
  Ca. 1925 up to 1945 rare.
Identical to 57T5301 = 12X825
Similar Tubes
Normally replaceable-slightly different:

Base Edison big E27 = 27 mm
Filament Vf 2 Volts / If 13.5 Ampere / Direct / Specified voltage AC/DC

This tube is listed on page 762 of the Fall 1929 issue of the Sears Roebuck catalog, along with a range of Silvertone receiving tubes. It is a half wave argon filled battery charger rectifier type suitable for use with alarm and clock systems. It was also used in radio for charging small accumulators. The charging rate is 2 amps. It has a maximum DC output of 75 volts. Usual mounting of the tube is in a green painted iron box with external battery lead connections. The anode of this tube is the skirted part of the base and is insulated from the screw thread. the 57T5303 is identical except for the wire lead for the anode.

Dimensions (WHD)
incl. pins / tip
x 108 x 54 mm / x 4.25 x 2.13 inch
Information source Sears, Roebuck Catalogs (Silvertone)   Pages 762 and 763
-- Collector info (Sammler)   
- - Manufacturers Literature

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