I had the GFA-555 and it did this every time you turned it off. It sounded like a little squiggle type of sound but I was told by Adcom that it was normal.
I also have an old GFA-555 that still sees action and it has always that has always done the squiggly sound thing at shutdown. I was also told by Adcom that it is normal. If I remember correctly lowering the volume seemed to make it less obvious. I just leave mine on 24/7 anymore so the squiggle is gone.
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