After some years of intense use it might be your Deck needs a new audio connection.
Pretty straight forward if you know how to solder 😀 Otherwise i’m not advicing to do so, you will damage your deck more than it already is!
By doing this i figured out it’s possible to selfground on the grounding of the audio points. Great! You still get a phono level, but boosting is easier than grounding properly!
I´m struggling with using this mod in my studio setup, but it seems to work well. Makes me wonder why Technics didn´t ever think about selfgrounding and line levelling!?
It’s the first time i’ve opened up a 1210 and it seems like there are some more interesting mods possible!