Just look at the mounting diagrams of any old arcade monitor at happs, *most* TV's are the same - the 4 mounting ears at the corner of the tubes.
Some dont have those, and are basically friction fit into the plastic case. I haven't seen one like that personally, but I've heard tell they exist. I'd guess they'd be smaller sets, 13" and the like, because I just dont see a 100 lb 30" tube being held by friction.
Most 19 or 20" I've decased look just like an arcade monitor when naked since that's what they are.