I have had a pair of Tivoli model twos since the late 2000's now and I have loved their sound! Recently though, right about when I turn it on, when I move the volume up and down it makes a sound like there are scratchy pots. Once it's on for a little bit and it warms up, it's absolutely fine though. I tried spraying contact cleaner on the pots, but so far that has done nothing. If you had this problem or think you know what it might be, please chime in!