Abstract :
This paper discusses the theory and use of three tube-design monographs which make it possible to determine quickly the required modifications of physical parameters which will provide desired alterations in tube characteristics. A brief description is given of the electron-tube theory upon which the nomograph design is based. The use of the nomographs is explained by means of the solution of some typical design problems. The nomographs, which are applicable to many diode, triode, and pentode problems, include physical parameters such as interelectrode spacings, wire sizes and grid TPI\´s, together with tube characteristics. In the use of the nomographs, the parameters and characteristics of an existing tube type are the basis for the determination of the parameters required for a desired complement of characteristics. These design nomographs are useful in both the development of new tube types and the modification of existing types to maintain "bogie" characteristics in factory production.
