Abstract: A yoke for a cathode ray tube has deflection coils and a plurality of trim magnets mounted thereon. A tubular shield of Mu-metal slides over the coil to suppress an electromagnetic field radiated therefrom. In one embodiment, the trim magnets are inside the shield so that it has to be removed in order to adjust the magnets. In another embodiment, the trim magnets are outside the shield, so that they may be adjusted without necessarily having to remove the shield. The shield greatly reduces outwardly directed electromagnetic radiation in the vicinity of the cathode ray tube which allegedly might produce a health hazard to an operator at a video monitor terminal.