Are you sure it's the NAD? Swap speakers to check and make sure it's not one of them. The make sure all the cables are properly connected, maybe one is loose. Also, make sure it's not a input cable from what ever source your listening to.
Does it change with the volume control? Could be a noisy pot. If so, unplug it, and saturate the volume control with Caig Deoxit, move the control around several times.
I'm sure there is more to check...doesn't sound like a fuse though...
Does it change with the volume control? Could be a noisy pot. If so, unplug it, and saturate the volume control with Caig Deoxit, move the control around several times.
I'm sure there is more to check...doesn't sound like a fuse though...