Abstract: Klystron cavities having linearly movable tuning elements are tuned simultaneously by a single master control which tilts a tuner drive platform. The motion is transmitted to individual cavity tuners by drive elements on the platform at selectable distances from its tilting axis so that the tuning rate of each cavity may be selected for proper tracking with the others. Individual position adjustments of each tuner allow exact setting at a selected reference frequency. The combination of the two sets of independent adjustments permits the resonant frequencies and tuning rates to be independently set at a given reference frequency, or alternately the resonant frequencies may be aligned at two different reference frequencies. Thus the cavity frequencies are made to track during continuous tuning over a wide range.