Abstract: An improved circuit for the stepwise variation of an operating voltage of a deflection amplifier of a magnetodynamic deflection system for a charged-particle beam in dependence upon a required deflection speed. At least one diode is coupled to a voltage supply source and is poled in its forward conduction direction to an operating voltage terminal of the deflection amplifier. At least one capacitor is coupled by a terminal thereof to the cathode of the diode, and a switch driven by a control device is coupled to the other terminal of the capacitor for connecting the capacitor either to ground through a resistor or to the anode of the diode.