Compensation for undesired shifts in the D.C. voltage level of a signal being propagated through a charge-transfer delay line is provided by compensating stages spaced at regular intervals along the delay line. The compensating stages are preferably transistors of the same type as that used in the delay line and having their source (or drain) electrodes connected to appropriate nodes along the delay line and their gate electrodes supplied from a pulsed source of voltage having controllable voltage amplitude and pulse repetition rate. The drain (or source) electrodes are grounded for shifting the D.C. voltage level in a first polarity voltage direction and are open or connected to a D.C. voltage source for shifting in the opposite polarity voltage direction.