New beam power tubes for UHF service

This paper is, in effect, a progress report on the continuing development of high-power, grid-driven, uhf beam power tetrodes similar to the 6448. It is divided into four main parts: 1) a brief history of the development and field usage of the 6448; 2) a review of the basic design philosophy and construction of the 6448; 3) a description of a new developmental 27-kilowatt uhf beam power tube, 4) a discussion of other new uhf beam power tubes for pulse service.