Abstract: A color television receiver circuit for preventing excessive X-radiation is described. A spark gap is coupled between the high voltage supply for the color tube and ground. Should the high voltage output tend to exceed a level beyond which undesirable X-radiation may be emitted, the spark gap breaks down, effectively shorting the high voltage output to ground and preventing the excessive voltage condition. At the same time, the picture is eliminated and the viewer must have the set serviced. Two embodiments are described in detail. In one, the spark gap is built into the tube socket of a high voltage rectifier; in the other, the spark gap is incorporated into a voltage multiplier circuit.