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ID = 68291
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:  Triode, vacuum   RF/IF-Stage 
  Ca. 1925 up to 1945 very rare. ***
Identical to 57TX99 = X99 = UX199 = CX299 = 199

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 3.3 Volts / If 0.06 Ampere / Direct / Battery =

Pages 762 and 763 of the Fall 1929 Sears Roebuck catalog lists Silvertone tubes for the first time, with a totally new type number, for example 57tX99 = UX199. Reaearch has not yet provided a manufacturer of these tubes or a location of a factory and Tyne's "Saga of the Vacuum Tube" page 362 ststes: "No information available for Silvertone". It is presumed that these tubes were made by the Sonatron Tube Company, with an address in Chicago and also in New Yorkk and it is 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 state that the company "ended its association" with Silvertone (radios and or tubes is uncetain) in 1972.

Dimensions (WHD)
incl. pins / tip
x x 25 mm / x x 0.98 inch
Information source Sears, Roebuck Catalogs (Silvertone)   Fall issue 1929 pages 762 and 763
Saga of the Vacuum Tube, Tyne   pages 359 and 362

uxsockel_11~~27.png 57TX99: Fin Stewart
Fin Stewart

Just Qvigstad

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