Aha. I just looked at the mask in my cabinet, and it's definitely shaped to fit the bulb-y profile. The price of this CRT is hard to resist, though, so I think I'll give it a try. If it doesn't work out in this set, I may be able to use it in another 12-inch TV.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html