ayre v-5xe has consistant noise after warm up

Michael said after paying shipping both ways, there may not be a fix anyway, so you can live with it,or they would look at it. I just bought the unit used and the previous owner just got it back from Ayre for a different problem, and was told by Michael that everything was checked out. I talked to Michael before I bought the unit, and again since I heard the problem.I could not get any idea what could be wrong from Michael which is why I came here. The seller from a different site was rather difficult.

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?