Radio receivers were originally operated by battery. The term batteryless radio was initially used for the radio receivers which could be used directly by AC mains supply (mains radio).
The line-operated vacuum tube receiver was invented in 1925 by Edward S. Rogers, Sr.. The unit operated with 5 Rogers AC vacuum tubes and the Rogers Battery-Eliminator Power Unit (power supply). This unit was later marketed for $120 1 as "Type 120". He established the Toronto station CFRB (an abbreviation of Canada's First Rogers Batteryless) to promote sales of the product. Batteryless Radios were not introduced into the United States until May, 1926 and then into Europe in 1927.
The line-operated vacuum tube receiver was invented in 1925 by Edward S. Rogers, Sr.. The unit operated with 5 Rogers AC vacuum tubes and the Rogers Battery-Eliminator Power Unit (power supply). This unit was later marketed for $120 1 as "Type 120". He established the Toronto station CFRB (an abbreviation of Canada's First Rogers Batteryless) to promote sales of the product. Batteryless Radios were not introduced into the United States until May, 1926 and then into Europe in 1927.
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