ayre v-5xe has consistant noise after warm up

Before sending it back to Ayre, try the amp in a different system to see if you can duplicate the problem, or at a minimum, try a different preamp. You need to trouble shoot your system first to make sure that the amp is the problem. Please remember, that any problems upstream get amplified by the Ayre.

Could it be a tube in your SF pre amp going microphonic?
Perhaps you can borrow a substitute preamp to confirm .
Also try a decent pair of shielded XLR interconnects .

The amp will make this noise sitting by itself, not hooked up to any other equipment or speakers.

Okay, the sound is coming from the amp and not through the speakers....that's not normal, send it back to Ayre. Did you try the amp on a diffeent ac circuit?

The noise right now is a nuisance. Michael's advise to live with it because there may not be a fix, and it still functions may be the best approach right now. My initial question is not being answered. Has anyone dealt with this? I find it hard to even explain, so a past experience would be helpful. I have a good tech,if I could get a better grip on what may be happening, except Michael says Ayre equipment always gets sent back to the factory because of there uniqueness.