If you have ample and cheap/free storage space, keep all three. The only thing not "easily" fixed (not easily, but no magic) is the phosphor on the inside. All

If you have ample and cheap/free storage space, keep all three. The only thing not "easily" fixed (not easily, but no magic) is the phosphor on the inside. All other components can be upgraded and replaced by competent people. Don't let them be a drag on your soul and don't feel guilty. Use the third with joy! If you don't have space, throw them away of course, no worldly possession is worth hassle in itself. But if you keep them, their value as cultural artifacts will continue to increase. Also with time, more people will be willing to pay the (high) cost of rebuilding them. I predict there will be at least one canonical company in the US which will spend many, many years rebuilding CRTs for collectors, enthusiasts and museums.