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How to identify a faulty CRT?

Hi everyone - first time newbie here! I've had an interest in electronics since I was a kid, but broke more stuff than I fixed. Now trying to make my interest of practical use...

I've acquired a broadcast video monitor, probably 30-35 years old, and I'd like to have a bash at tracing the fault and trying to repair it. However, the symptoms it's displaying, and it's age, make me think it has a failing CRT - and there's no way in hell I'm ever going to get it running again. I'm figuring it's either the tube that's about to fail, or a (potentially replaceable) component elsewhere. Check the video of the raster I put on YouTube, and let me know if I'd be better just scrapping this and finding a new project. Thanks.

https://youtu.be/9Md0j7WGCSo
 
PRIMARILY a vertical deflection loss with a slight amount of power supply pull in.
Give brand and model for direction..
 
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