I have a CRT that I removed from a piece of Tektronix medical
equipment. It may be useful to someone. The piece of equipment
was working when I dismantled it. This CRT had a clear, bright
trace. The number on top of the CRT appears to be 521 F 64. This
has been in my way for a couple of years. If no takers on here in
the next few days, it will go in the trash. You pay only
shipping. Please email if you want pictures, dimensions, etc.