OldSynths

Hi all,

I just bought a Yamaha CS5.  There are a few crackly pots, but they're
improving with use.  What isn't improving with use is a random
crackling in the output signal.  I thought originally it might be the
keys, but I even hear it when I turn up "initial level" in the amp
section so that you hear sound without a key-press.

Does anyone have an idea what the root of the trouble might be?  I've
cleaned the output jack with contact cleaner, tried plugging it into
several speakers/amp systems, etc... all with the same result.

The person I bought it from didn't hear the crackles, so I'm wondering
if something happened during transport or if he just didn't notice.

Cheers,
-Josh