Analysis of the operation of double-control grid tubes

In this paper a mathematical treatise is given which permits to calculate conversion transconductance, modulation distortion, crossmodulation, modulation trim and converter whistles from the empirically found static characteristics of the tube. Whilst it is not anticipated that in practice the above-mentioned effects should really be evaluated along the lines indicated in the following, viz., from the static characteristics, the theory thus elaborated offers a clear view and understanding of the manner in which these effects are brought about. Also the theory suggests directions of improving the operational qualities of such a tube by indicating the desirable features of the characteristics. An attempt has been made to illustrate the essential points of the theory and its results by means of a number of figures with short explanatory text in such a way that their preliminary study alone gives to the reader a first survey of the matter.