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A discussion and review are given of the service and design requirements of transmitting tubes intended for application in the ultra-high-frequency spectrum. These requirements fall in two classes: (1) those imposed by service conditions and (2) those imposed by the frequency at which the tube is operated. The fulfilling of these requirements has led to certain design and manufacturing problems, such as the reduction of grid emission, choice of anode material, choice of a suitable mechanical structure, etc. A description of the novelfeatures of construction and the operation of three new ultra-high-frequency transmitting tubes are also given. Two of these tubes are the RCA-815 and RCA-829 which are push-pull beam tetrodes while the third tube, the RCA-826, is a triode. Some precautions necessary for obtaining satisfactory operation with these tubes are given.