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35 w of power was produced at 132 mc using four transistor amplifier modules in the final stage, combined by a hybrid network. The use of the hybrid system permits summing of signals with a high degree of isolation between the amplifier modules. This permits operation of the amplifier modules to their full power capacity without requiring a match of device characteristics or equal power-sharing capabilities. Isolation is also realized with respect to load mis-tuning and greater reliability is achieved.