Abstract: An apparatus for influencing the movement of electron beams of a cathode ray tube comprises means for magnetizing a strip of magnetizable material disposed about the neck of the tube. The magnetizing means includes a pair of members each incorporating magnetizing coils. Means including a hinge is coupled to the members for providing a first opened position of the members for placing the magnetization on the tube neck and a second closed position of the members for encircling the tube neck. A source of magnetizing current is coupled to the magnetizing coils for developing magnetic fields in the vicinity of the coils for magnetizing the magnetizable strip.