Transformer hum?

Today, I tried using cheater plugs, but it didn't help.
I've been plugging and unplugging, isolating, trying
different combos, etc. etc. Unless the cheater plugs
need time to work, need to burn in or something, I can say that cheater plugs are not the answer. I do not have dimmers on this circuit. I have tried disconnecting
the TV cable. Didn't help. I don't know if I have mechanical hum, or not. It seems like a weird coincidence that I have 5 items in my system that
use transformers and four of them hum. I have florescent lights on a completely different circuit and when they are on, the humming is much louder. But when I turn off all the lights in the house, I still hear
a light humming coming from my components.
To add another wrinkle, one of my Levinson 436's
hums, but the other is stone silent. I have heard that
a ground loop hum can be identified by whether or
not you can you can hear it in the speakers. I can
hear it in one speaker, but not the other.

I suspect the electrical system, but I don't know
enough about it to know if I am on the right track,
or not. I was hoping the AC conditioner would solve
all AC problems, but it seems susceptible to whatever
is affecting the other components. Or, coincidence or not, I have four components that just happen to have
mechanical hum.

Does this information help?

Anyone?

Take one of the devices to a friend's house that has good power and see if it hums there. If so your transformers may need attention. I suspect that these transformers make the noise even when in stand alone and not hooked to any other components.

It doesn't matter if the dimmer is on the same circuit. Everything is tied together back at the breaker box. The dimmer on the light in my stove hood upstairs made a balanced line conditioner hum in my basement. If you are in an apartment your neighbor may have a dimmer causing the problem. The fact that a flourescent light makes it worse confirms my suspicion that it is noise on the AC line.

Mechanical hum means the piece is vibrating i.e., the hum is not coming from the speakers. Cheater plugs will have no effect on this hum.

Have you tried turning off everything in the house yet?

Mechanical hum happens because the transformer is working a little harder to provide the correct current to the gear.

See if you can borrow an issolation transformer or one of those PS Audio power regenerators (or similar). These will provide the correct current to your gear, and will allow you to hear if the hum goes away.

The above are a solution to mechanical hum. Sometimes though the transformer in this piece of gear will hum a little because it is getting the outside power. Better one than all the gear. It can always be muffled away if this does happen.

Try taking the Anthem completely out of the system. They are notorious for ground loop problems.