Development of a System of Line Power for Radio

A short history of the development of power supply apparatus for radio receivers is given, including a brief discussion of the technical requirements, such as the most desirable suppression characteristics, the necessity for voltage regulation, etc. The various devices which have been developed are described. The present status of the art and the scope and limitations of the different types of apparatus are discussed. The series wired radio set with common power supply for plate filament and grid circuit is discussed in some detail, and curves of the operating characteristics of such a set are given.