Vacuum tubes as high frequency oscillators

Vacuum tubes as oscillators and amplifiers at frequencies greater than 100 megacycles (3 m) are considered in this paper. The type of construction used in a large number of different tubes, and the characteristics of the tubes, are presented. Circuits for operating the tubes also are considered and the theory of operation and the factors limiting ultra-high frequencies are discussed. Principal attention is given to the tubes as oscillators, with brief consideration of the problem of amplification.