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An analysis is presented showing the effect of grid displacement on the plate current of a planar triode. This is defined in terms of a new parameter called the motional transconductance. The analysis indicates that a useful mechanical displacement indicator may be constructed by moving the grid and noting the change in plate current. The analysis also indicates that the effect of certain modes of grid displacement on the plate current may be eliminated under conditions which are stipulated. Since microphonic effects are, in great part, caused by the mechanical motion of grid structures, the analysis indicates how microphonism may be reduced. It is shown that the electrical transconductance is large under these conditions, for the case investigated, so that the tube functions normally as an amplifier. Preliminary experimental results for comparison with the theory are presented.