Burn in==Throw
Does it still have the yoke? If so, carefully remove the yoke clamp and slide it off (keeping the clamp, yoke, and magnetic purity rings..just in case you ever need them on another tube/chassis), remove any taped/glued-on strips of metal encased in plastic/rubber [beam bending magnets] and anything else small but removable from the tube. In fact, the black pin protector surrounding the pins if the glue is dry and brittle it should pop right off. Keep these around if you ever need them. They don't take much space and are totally inert, unlike the tube.
Toss the tube (preferably putting it in a can 25' away and breaking the back of the neck letting the vaccum out to prevent imposion by the trash collector if you can indeed throw it some areas, like mine, require you to take it to a hazardous waste facility and pay them to take it.)
BTW--a 19" computer monitor, is actually too small to put into the frame. If it has the right mounting ears, it may just barely fit. But a 19" monitor is only 18" viewable. An arcade 19" monitor is larger and the frames are built for that (20" outside corner to corner)