Vacuum tubes using alternating current
In 1924, Edward Rogers formed Rogers Radio Ltd of Toronto to manufacture radios. While visiting the United States, he witnessed an experimental tube operating using AC current demonstrated by Frederick S. McCullough. The demonstration proved that an AC operated vacuum tube was feasible, but it exhibited too much hum, due to the filament cycling at the generator frequency. Returning to Canada, Rogers experimented with ways to reduce this hum by redesigning the filament and successfully demonstrating the hum reduction in the fall of 1924. The Standard Radio Manufacturing Corporation was formed in 1925 to mass-produce this new AC operated vacuum tube. Rogers produced and marketed one of the first Canadian and United States AC operated triode vacuum tubes with the production of the Rogers R30 and R32. RCA would market the UX-226 AC triode in September 1926. In 1928, Rogers changed the name from Standard Radio Manufacturing to the Rogers Radio Tube Company Ltd. Rogers by this time had put more emphasis in vacuum tube development and manufacturing over the manufacture and selling of radio sets. During this period, Rogers was in full production of AC operated tetrode tubes similar to the RCA UY-224. ==See also==