It looks like you have severe HiFi head switch noise, You can get rid of it by moving the switch point between audio head A and audio head B on the video drum, But before doing that find out how many tapes are exhibiting the problem, Clean the entire tape transport and make sure there is no loose or broken tape path components.
Here is how to do it if you have a VCR with drum motor on top, Proceed at your own risk, Keep in mind there is a sweet spot between excessive audio head switch noise and video head switch noise, You have to find it, but it will not be the same spot for all tapes unfortunately:
https://youtu.be/AqGmOiU41i8