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This paper consists of a theoretical and experimental study of the frequency variation of gain of magnetic electron multipliers. It is shown that, for multipliers of the type studied, the behavior as a function of over-all electron transit angle is very similar to that observed for electrostatic electron multipliers previously described. Up to frequencies of about 500 megacycles, loss in gain can be ascribed to a spread in transit angle resulting from the emission velocities of secondary electrons and the varying paths of electrons through the stages of the multiplier. From the results given, it is possible to predict the useful upper frequency limit of a magnetic electron multiplier of the type studied.