Abstract: A cathode-ray tube display system having a dynamic focus circuit to compensate for the inherent defocusing of an electron beam resulting from differences in the distance the beam must travel between an electron gun projecting such beam and a display screen as the beam is moved from position to position about the screen. The circuit is fed by a variable focusing signal having a predetermined bandwidth extending from zero hertz to a predetermined frequency. A combining network is included in the circuit for combining a reference voltage, an amplified, capacitively-coupled first portion of the applied variable focusing signal, and an amplified second portion of the applied signal to produce, at a focus electrode, a composite focusing signal. The produced composite focusing signal has a nominal focusing voltage level produced in response to the reference voltage and selected to provide proper focusing of the beam when the beam is positioned at the center of the screen.