Abstract: A circuit arrangement for correcting tilt and bow distortions in a raster scan display comprising a series arrangement of a current limiting inductor and diodes poled in opposite directions, which series arrangement is connected in parallel with the line deflection coil. A transistor is connected in parallel with one diode. In the absence of a control signal for the transistor the circuitry shunting the deflection coil acts as a centering circuit with a static offset current being produced through said coil which produces a static magnetic bias in the direction of line deflecton. To correct the geometric distortion the transistor receives a field frequency signal input which modulates it impedance at field frequency to produce a modulated magnetic bias through the deflection coil.