Not sure if this'll help at all, but these are a couple patterns I devised specifically to test for "blooming" on CRTs like my Sony 34XBR800, which you're welcome to try.
These do not work the same as a needle pulse, but they should give you an idea if you're excessively overdriving the white level / Picture setting on your CRT.
For the best detail on the TV, you should keep the Picture setting below the point where the horizontal white line begins to "bloom" (get thicker) inside the area of the gray square, or starts to seperate into "two lines".
This test works best with a progressive 480p input (which I don't use on my TV anymore), with no interlacing on the screen. But the blooming should be visible on other signals as well. If the pattern is displayed in an interlaced mode (which is the way most signals other than 480p display on a Sony CRT), then the white line will be a couple scanlines wide to start with, which might be slightly more confusing.
Two versions of the pattern are attached below, one in "full 0-255 swing" levels, and another that's already been condensed to 16-235 "studio-swing" levels.
If you try these, do not leave them on the screen too long to reduce any possibility of burn-in.
RGB 0-255 "full swing" levels
RGB 16-235 "studio swing levels"