To perform purity on a set, you'll need to start with red and also degauss the tube before you start... Pull the yoke back and adjust the purity rings until you get the red blotch in the middle of the screen then push the yoke forward again and see if red fills the screen without any fading...
Shango has videos that are helpful
https://www.youtube.com/watch?v=QNtsTKVPO7I
https://www.youtube.com/watch?v=1AWG61TAIHg
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Looking for an all tube or hybrid color TV set from the late 1960s, early 1970s that's in a steal cabinet..
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