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ABSTRACT
In the case of vacuum tubes it is a characteristic of the subject that very little cogent design information relating to practical tube forms has been published. This study presents a few working rules, approximations and design procedures that may prove helpful in dealing with diode, triode and pentode tube forms.
It is shown-that the space-charge current in practical diode structures may be predetermined, with sufficient accuracy, by graphical procedures based on certain approximations. For low mu, medium mu and high mu, triode configurations, methods of arriving at the tube geometries and electrode dimensions to meet given specifications are presented. The complementary problem of computing the tube parameters and volt-ampere characteristics for tubes of known dimensions is also examined. A method is proposed for arriving at the parameters of a practical pentode tube form which is neither wholly planar nor cylindrical. For a pentode with variable mu action, a procedure is described for synthesizing the grid structure that will yield the desired remote cut-off characteristic. The utility of electrolytic tank models in evaluating important tube properties is also reviewed.