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An approximate triode theory has been organized in terms of the operating parameters and electrode spacings so that, with the aid of graphical representations, the tube designer can readily and very quickly predict the RF performance of a grounded-grid amplifier or the effect thereon of changes in design parameters. It is thus possible to minimize the experimental work required to achieve a desired performance. The effects of changes in design parameters are shown by illustrative examples, and a study of these examples confirms that substantial improvements in the performance of present-day tubes cannot be obtained by minor changes in one or two parameters. Significant improvements may only be obtained by pushing all design parameters to the limit of practicability. The performance predicted by this theory is compared with experimental measurements of other workers with satisfactory agreement. It is concluded that the theory is quite adequate for design work.