PURPOSE: To automatically correct the fluctuations of the vertical and horizontal amplitudes caused by the high voltage fluctuations only in a small area of an anode current for a CRT deflection circuit of a TV receiver, etc.

CONSTITUTION: When the ABL voltage which varies in response to an anode current is kept in a prescribed small current area, anode current detecting circuit 4 outputs the correction voltage accordand with the ABL voltage. The correction voltage is inputted to each minus terminal of the 1st and 2nd operational amplifiers 5 and 6. At these minus terminals, the voltage is kept at a fixed level in a large current area and then starts to rise by an extent equal to the correction voltage with the start of output of this correction voltage. Meanwhile the present amplitude control voltage is supplied to each plus terminal of both amplifiers 5 and 6 from the vertical and horizontal deflection circuits 8 and 9 respectively. Therefore the voltage is kept at a fixed level between the input terminals of both amplifiers in a large current area and the amplitude is set based on the voltage. When the correction voltage is outputted in the small current area, the voltage is compressed between the input terminals of both amplifiers and therefore the output voltage levels of both amplifiers are reduced. As a result, both vertical and horizontal amplitudes are increased.