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ID = 68442
United States of America (USA)
Brand: WLS (tubes), World's Largest Store - see also Sears, Roebuck & Co; Chicago, IL
Developer: Westinghouse El. & Mfg. Co. - see also Canadian W. 
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 very rare. ***
Identical to 57T250 = WLS550 = UX250 = CX350 = 150 = 50

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

Pages 762 and 763 of the Fall 1929 issue of the Sears Roebuck catalog lists Silvertone tubes for the first time, with a totally new type number, for example 57T250 = UX250. Research has not yet provided a manufacturer of these tubes or location of a factory and Tynes "Saga of the Vacuum Tube" page 362, states "No information available" for Silvertone. It is presumed that these tubes were made by the Sonatron Tube Company, with offices Chicago and in New York and it is also known that Sonatron acquired three smaller companies in 1929, before they themselves were acquired by National Union in September 1929 (Tyne page 359). Silvertone tubes continued to be available for some years and tube boxes with both Sears Roebuck and Silvertone printed on them are relatively common in the US. Sears Roebuck Archives states that the company "ended its association" with Silvertone (radios and or tubes is uncertain) in 1972.

Information source Sears, Roebuck Catalogs (Silvertone)   Fall 1929 issue - pages 762 and 763
Saga of the Vacuum Tube, Tyne   Pages 359 and 362

uxsockel_11~~34.png 57T250: Fin Stewart
Fin Stewart

Just Qvigstad

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