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I believe it is ferrite. A magnet will stick to it, but it's not magnetic itself and quite heavy. I also believe the it's to screen out the magnetic field between the yoke and the convergence coils. The copper ring, well, it has a ground wire running to it. I also wondered if it is was used to reduce X-radiation, however I think it would have to have lead in it then. I had never seen one of those ring setups on any roundie I had ever worked on till till I got this one. Does a CT100 model (the 15 inch set) use the same type of set up with the rings?
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