PURPOSE: To realize the miniaturization and economy of equipment using an amplifier by reducing the power consumption of the traveling wave tube amplifier so as to facilitate the reduction in the operation cost and the power and heat design. ;CONSTITUTION: An amplifier is made up of a traveling wave tube amplifier 13 having two collector electrodes 10, 11, 12 or over and a power supply 14. A potential less than 60% of the potential of the collector 12 when minimum power consumption is obtained at the saturation is set to the collector 12 located remotest from an electron gun 15 to which a minimum potential is set among all the collectors of the traveling wave tube 13 so that the power consumption is a minimum power consumption or close thereto in the nonsaturation state or an intermittent saturation representing a tentative saturation.;COPYRIGHT: (C)1994,JPO&Japio
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