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The introduction of all coaxial ring-seal terminals, a thoriated cathode, a re-entrant anode with integral coolant jacket, and a novel assembling technique has facilitated the development of a new power triode for 50-kw rf output up to 110-mc frequency. Increased power output ratings are available at lower frequencies. The bandwidth is suitable for television broadcasting. Design requirements are reviewed for optimum electrode geometry, heat-dissipating ability, minmum lead inductance, high rf conductivity of the vacuum seals, and other desiderata for high-power, high-frequency service. Mechanical features are described, and the circuit performance of the tube is discussed for lower frequencies as well as the vhf region.