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ID = 68445
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 57T5303
Similar Tubes
Normally replaceable-slightly different:
Different connections:

Base Edison big E27 = 27 mm Other combinations of connections.
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 acumulators. The charging rate is 2 amps. It has a maximum output of 75 volts. Usual mounting of the tube is in a green painted box with external battery connections. The anode of this tube is a thick wire soldered to the "skirted" part of the base and this is insulated from the screw thread. This wire is external to the bulb and shaped to end near the top of the glass. The 57T5301 tube differs from this tube as it does not have the wire anode lead. In all other respects it is identical.

Information source Sears, Roebuck Catalogs (Silvertone)   Pages 762 and 763
- - Manufacturers Literature   
-- Collector info (Sammler)

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