My Ref 5se also makes no rattling or ringing sounds when moved. It was dead quiet when I moved it around while playing with footers. Does anything seem loose inside? If the box was dropped hard enough to shift the front panel slightly, it may have loosened or jarred something else as well.
My Ref 110 has KT120 tubes and also makes no sound when moved. I do use Herbie's tube dampers on all the 6H30 tubes in my system. But that would not affect on the KT120 tubes.
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