Power grid frequency monitoring in Europe and analog audio (vinyl)

Many turntables, old and new, have asynchronous motors and many others, old and new, even of well-known brands, have synchronous motors. In the latter, the speed depends on the mains frequency.

But, how stable is it?

Now, thanks to Swissgrid and their long-standing collaboration with other operators, we can see European data in real time. Here.

I discovered this interesting service after reading a post in the Italian audio forum Melius Club. I owe thanks to the poster, whom I do not know (nickname: redpepper).