< There shoudln't be any extra hazard from firing electrons at the screen, < but I am still _very_ curious as to what's happening. I've used 40 or 50 < year old CRTs with no problems, you see. I have two O'scope crts (3BP1 and a 2AP1) that are still good (they were purchased as military surplus when I was a teen for homebrew use) and neither were made much later than 1958 (maybe much older!). I know they work as the scopes I built with them still operate! The glass doesn't decay. If the phosphor is peeling it may be that someone has vented the tube to remove the implosion hazard. Allison