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Fluid amplifiers are now receiving considerable attention by control engineers due to their potential for high reliability, ruggedness, and fast response. For applications such as speed controls for jet engines, steam turbines and other prime movers, fluid amplifier systems are now being studied that use both digital and analog techniques. This paper describes several approaches to shaft speed control that differ from the above techniques in that fluid circuits analogous to A. C. carrier systems are used. Results of testing are presented for three specific “a-c” fluid amplifier circuits.