In a deflection circuit such as for a CRT display device, modulated current that is generated in a raster control circuit especially for East-West pincushion distortion correction, is coupled to a deflection circuit output stage (100) via a Class A operated amplifier (Q2) serving as a current source having a high output impedance during retrace. The current source prevents coupling of a signal at a retrace frequency during retrace between a high voltage winding (W1) of the flyback transformer (T1) and a retrace resonant circuit (27) that includes the deflection winding (LH). The high output impedance of the amplifier current source during retrace maintains the average value of the modulated current during retrace unaffected by an amplitude of a retrace voltage that is developed in the retrace resonant circuit (27). In this way, ultor voltage loading variation is prevented from causing "mouseteeth" distortions.
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