Are these safe to use in a HiFi system?
I still have my intermittent buzz on the phono stage, which is cured by my Power Inspired AG1500.
So it is mains related, and very difficult to cure.

Rather than using a sledge hammer to crack open a walnut, I am tempted to build/buy a small isolation transformer in a box to feed just the phono stage, if they are indeed safe. Otherwise I will continue to use the AG1500.

I am assuming that they are the same as a balanced mains units, so I need to ensure that there is a differential breaker on the output?