Not likely to be DC on the line, but if you think it is, I have a PS Audio Humbuster I can sell you which did not solve my problem. For toroidial transformers, the mounting position is sensitive to hum, try rotating the right tranny around its axis for minimum hum, and the tightest position of the mounting nut may not be minimum hum. You can also order polymer washers from Herbies to better damp the hum, If the Anthem is 15 years old, it may also be the filter caps which may need to be replaced.
