Transformer Noise

I have an old Krell KAV-2250 that sounds pretty nice, except for the transformer hum.  The hum is noticeable when the volume is at zero and slightly audible at lower levels.  The amp has been unplugged for a few years.  Is there anything I can do to eliminate the hum or does that just something I have to live with due to the high power transformer?  I was going to send this to my son, but I think it might really bug him (it's bugging me too!)