Abstract: A voltage of a high voltage power source for accelerating an electron beam of a CRT varies responding to brightness of an image on a screen of the CRT, and a deflection angle of the electron beam is varied accordingly, the variation of the voltage is detected and is superimposed on a direct current power source voltage of a horizontal deflection circuit, hence a horizontal deflection output current of the horizontal deflection circuit is varied and the deflection angle of the electron beam is regulated to compensate the variation of the deflection angle due to the voltage variation of the high voltage power source.

Abstract: A television receiver in which a high voltage detection circuit detects the FBT output voltage which is supplied to the cathode ray tube, a comparison circuit compares the detected voltage with a reference voltage, and the supply voltage to the FBT is controlled by a control signal which represents the result of comparison. The control signal provided by the comparison circuit is also used to control the supply voltage to a drive circuit which injects base carriers to a high voltage generating transistor, so that a proper drive control takes place automatically depending on the load condition of the high voltage.