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Many feedback control systems employ amplifiers that incidently convert energy from one physical form to another. Amplification is accomplished by variation of a parameter that changes such conversion properties. Among a number of examples are variable-displacement hydraulic pumps and "Ward-Leonard" systems of motor control. Conventional linear response analyses usually are based upon the assumption of an "ideal" input energy source. Actual practice displays many instances when such an assumption is not valid. The load imposed on the controlled output may have a significant effect on the input power source. The method presented here takes such non-ideal characteristics into account. This paper is to be published in the Proceedings of the First IFAC Moscow Congress by Butterworth Scientific Publications in 1960.