The largest I have ever seen is the 40 inch Sony Trinitron model KV-40XBR800. There was also a KV-40XBR700 which I think is the same but lacking DVI input. These Trinitrons were flat and as such, EXTREMELY HEAVY, 300 pounds just for the television. The stand it came with was at least another 50 pounds. Although I have not seen one, I am aware of presentation monitors and a consumer television that Mitsubishi made which were 40 inch (not flat), and I have heard of a Toshiba television this size as well (probably not flat glass either). I'm sure they were heavy, but for being convex, they were likely not as heavy as the Sonys. At wikis and various other places discussing CRTs, I have heard tell of monitors or televisions made for industrial uses which were as large as 60 inches, but noone has managed to produce a simple photograph, so I cannot say how limited their use may have been. If you think about it, should an image that large be really necessary, it is probably time to move to projection just for practicality's sake, so I kind of wonder if a tube that size ever even really existed.