NAD 2600 and thumping noise


Okay, I just got a nice deal on an NAD 2600. However, when I turn it on and off there is a fairly loud THUMP. Even if the volume is turned down and the inputs are removed, it is still there. I know this isn't much to go on, but any ideas? Is this a matter of cleaning this baby up? Or have I bought a dying beast? Or something in between?

Many thanks! Aaron
aewhistory
I had a similar experience when powering down my Adcom 545. I was told back then by Adcom that it was nothing to worry about, as it was the amplifier doing some type of discharge. Sorry, I can not be more specific, but that was 20+ years ago and the Adcom is gone about the last 10 of those years.

Rich