Viiu,
I am not sure what kind of regenerator you bought. From your description, it sounds like an UPS (Uninterrupted Power Supply) designed for computer. If so, it is not a good idea to use them in audio system.
UPS generates dirty power. It was designed to keep computer running in case of power outage. It wasn't designed to provide clean power. It actually does more harm than good in an audio system.
The noise problem you described sounded like a loose ground wire somewhere, probable in the power outlet. If it were a ground loop problem, the noise should be constant, not intermittent. Ground wire and connection could be corroded after 15 years.
I have no experience with smart meter. Can you tell when its on/off cycle starts? If it coincides with the buzz, than it is the most likely cause.
Just a thought.
I am not sure what kind of regenerator you bought. From your description, it sounds like an UPS (Uninterrupted Power Supply) designed for computer. If so, it is not a good idea to use them in audio system.
UPS generates dirty power. It was designed to keep computer running in case of power outage. It wasn't designed to provide clean power. It actually does more harm than good in an audio system.
The noise problem you described sounded like a loose ground wire somewhere, probable in the power outlet. If it were a ground loop problem, the noise should be constant, not intermittent. Ground wire and connection could be corroded after 15 years.
I have no experience with smart meter. Can you tell when its on/off cycle starts? If it coincides with the buzz, than it is the most likely cause.
Just a thought.