A proportional fluid-jet amplifier has been developed which exhibits flat saturation characteristics and also has reasonable gains, differential output pressures, and noise levels. The amplifier’s output pressure did not drop below 68 percent of its maximum value for any differential control-port pressure in excess of that which caused maximum receiver output. A three-stage, gain block showed less than 3.5 percent decrease in differential output pressure for control signals as high as 200 times their maximum output value.

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