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ID = 67155
United States of America (USA)
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to 4618_WLS = WLS510 = CX310
Similar Tubes
Normally replaceable-slightly different:
  L10 ; UX210

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Transmittertube (Radio)
Filament Vf 7.5 Volts / If 1.25 Ampere / Direct / Specified voltage AC/DC

Page 711 of the Spring 1929 Sears Roebuck catalog announces a new tube - the 4618_WLS which is equivalent to the UX210 low power transmitting tube. The company tube was made by one of the small manufacturers used by Sears Roebuck and an example seen has the "WLS" (Worlds Largest Store) hot branded on the base. The Fall 1929 catalog has an entirely new catalog numberr and the 4618_WLS became the 57T210.

Dimensions (WHD)
incl. pins / tip
x 137 x 54 mm / x 5.39 x 2.13 inch
Weight 59 g / 2.08 oz
Information source Tube Lore (I)   page 16.

uxsockel_11~~24.png 4618_WLS: Fin Stewart
Fin Stewart

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