Operation of ultra-high-frequency vacuum tubes

Previous electronics analyses are extended by the introduction of more general boundary conditions. The results are applied to the calculation of the rectifying properties of diodes at very high frequencies and to the amplifying properties of negative grid triodes at both low and high frequencies. The effect of space charge on the various capacitances in triodes is discussed, and formulas for the amplification factor and plate impedance are presented in terms of the tube geometry. Finally, a discussion of the input impedance of negative grid triodes is given together with a comparison of the theoretical value with the results of measurements made by several well-known experimenters.