PROBLEM TO BE SOLVED: To provide a circuit to supply a power source to a traveling-wave tube having a structure which is small, inexpensive and strong against vibration and impact.;SOLUTION: A first control element 16 is turned on when the potential of a helix electrode rises to a prescribed threshold, determined by the ratio of the value of a first resistance to the value of a second resistance, with respect to the potential of a positive side heater electrode or a negative side heater electrode, to bring a first terminal and a second terminal into a conducting state. A second control element 17 is turned on, when the first control element 16 is turned off to keep the anode electrode and the cathode electrode at a same potential, and is turned off when the first control element 16 is turned on, to apply a voltage to the anode electrode by producing a potential difference between the anode electrode and the cathode electrode.;COPYRIGHT: (C)2005,JPO&NCIPI
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