A New 4-Tube Full Performance AM Superhet Receiver

Abstract

In 1958, Sylvania introduced a 5-tube 100 Ma. line of home radio tubes to aid in the reduction of heat from the original 150 Ma. ``All American Five''. Derived from the original 150 Ma. line, the new 5-tube complement featured more efficient cathodes to allow adequate performance from the 100 Ma. heaters. Sylvania now introduces a tube which combines two of the tubes from the 100 Ma. line into one envelope, providing a 4-tube string with performance capabilities similar to the 5-tube, 100 Ma. complement. This new tube, the Type 26HM8, is a triple-purpose tube serving as IF pentode, detector and 1st audio. The performance of the new 4-tube receiver is supplemented by the addition of a new improved power output tube, Type 40FR5.