From your description, this box has only one electrical connection, a power cord.
It reminds me of the "parallel line conditioners" of old. These devices were supposed to clean your AC line power.
Two examples that I can recall are the Tice Clock and the Coherent Systems Corp EAU-1 Electraclear.
Audiogon has lots of comments about the Tice Clock. Here’s one short thread --
https://forum.audiogon.com/discussions/anyone-remember-the-quot-tice-clock-quot-controversy?highligh...
And here’s an old Audiogon listing for the EAU-1 --
https://www.audiogon.com/listings/ac-conditioners-coherent-systems-corporation-eau-1-electraclear-pa...
Unfortunately, I could not identify your particular box. (Dunno if a pic would help either).
Good luck.
It reminds me of the "parallel line conditioners" of old. These devices were supposed to clean your AC line power.
Two examples that I can recall are the Tice Clock and the Coherent Systems Corp EAU-1 Electraclear.
Audiogon has lots of comments about the Tice Clock. Here’s one short thread --
https://forum.audiogon.com/discussions/anyone-remember-the-quot-tice-clock-quot-controversy?highligh...
And here’s an old Audiogon listing for the EAU-1 --
https://www.audiogon.com/listings/ac-conditioners-coherent-systems-corporation-eau-1-electraclear-pa...
Unfortunately, I could not identify your particular box. (Dunno if a pic would help either).
Good luck.