Hi, i have a NAD S300 and sometimes i hear an annoying noise from the right channel. I have done different tentatives and the problem regards only the right channel.Sometimes the right channel completely disappears. Unfortunatly is a problem that appears only sometimes so it's difficult to understand its origin. If you want and if it could be possible i can olso add an audio file with the recorded noise. Thanks in advance for helping me. Fabio

You may have some dirt/corrosion on the input selectors or other controls. Get a good commercial contact cleaner and spray all the controls. This is best done inside with the cover off rather than trying to squirt through the front plate. If that does not help (or change the sound) then you may have a bad solid-state component (transistor or IC) that will require some help. If things change but don't resolve, then dirt is the issue and you may need multiple treatments.