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The problems involved in HF high-power amplifiers or transmitters that do not require manual tuning or adjustment when the frequency of emission is changed, are discussed. An automatic tuning system for a high-power linear amplifier is described. This linear amplifier tunes to a band-limited signal, without requiring additional information from the signal source or exciter. A theoretical analysis of the control system performing the tuning function is presented and compared with the results obtained experimentally.