Abstract: An automatic Y-axis offset system for a cathode ray tube, which performs automatic positioning of a trace to a predetermined position on the cathode ray tube face such that the trace becomes visible, by applying a Y-axis offset voltage to the input signal voltage. The automatic positioning is performed when commanded by an operator through switch actuation. The offset voltage is produced by a feedback circuit which includes an amplifier receiving the input signal, a comparator for comparing an output voltage from the amplifier with a predetermined level, a counter which is enabled to count a clock signal so long as the level of output signal from the amplifier is different from the predetermined level, and a digital-to-analog converter which converts the count in the counter to an analog signal constituting the Y-axis offset voltage.