Hi there - anyone any ideas on this. I'm using an Audiolab 8000A (have been for 20 years!) and have noticed a buzz which is always there even with the volume set to zero - as you increase the volume the buzz gets louder. I've been considering buying a shielded mains lead to see if that would make any difference but could this be coming from something inside the amp? What do you think - cheers for any ideas!