I have a 5BP4 with good filament, is there anyway to test this CRT beyond that? I have a Sencore CR-7000

Thanks!

My experience is that 5BP4s, like 7JP4s, can only be tested in a working set. 5BP4s were made with very different phosphors, and even with good emission, some produce relatively bright pictures, while others make terrible ones. RCA and Sylvania seem to be the best, while DuMont are the worst.