Hi

Anyone have any idea what is going on in this scenario:

Kitchen outlets, all on the same circuit breaker all grounded but no GFI
outlets. AM radio plugged into an outlet is producing hum. Maybe what
one would consider to be normal. But...

Turn on a toaster oven plugged into a different outlet in the kitchen
and the hum *goes away.* Completely gone.

Plug a fan into the the "toaster oven outlet" and the hum gets worse.
Fan doesn't have to be turned on - just plugged in - to produce hum on
the radio.

Unplug both the toaster oven and the fan and the hum is back on the
radio. But it sounds worse when the fan is plugged in.

Is this anything to be concerned about? This is an apartment so I would
have to give the owner clear insight into any problem with the wiring,
if this represents something that should be corrected. And this only
started happening in the last couple months. Up to that point - no hum
on the AM radio.

Rick