2970

The American company Sears Roebuck , with its head office in Chicago sold the standard range of American designed and made radio tubes from 1925. A few small manufacturers made these tubes and they were branded "WLS" (Worlds Largest Store). The company allotted each tube a four digit type number. The company also sol;d regular branded tubes such as Radiotron, Cunnungham, Meteor and Solartron.

The Fall 1925 issue of the Sears Roebuck catalog, page 552 shows the 2970 as the UV201A and made by Meteor. The 2970 is listed in the Fall 1926 catalog, page 639, as made by Solartron. This continues through the catalogs until Spring 1928, page 619, where it is listed as a UX201A, still being made by Solartron. Thes are the only tubes found to use thes manufacturers brands. The new type number series used by Sears Roebuck from the Fall of 1928, page 671 shows the tube as type no 4601.