Have you tried it with no source connected? Do you hear it when using phono only? Is it a "bleed through" or constant magnitude in sound.
From the manual: " You may notice some "bleed through" of the tuner or other auxiliaries when the phono is in operation. This is because of the very high gain of the phono stage and also because shielded wire is deliberately not used for the other inputs because of its sound degrading qualities...."
From the manual: " You may notice some "bleed through" of the tuner or other auxiliaries when the phono is in operation. This is because of the very high gain of the phono stage and also because shielded wire is deliberately not used for the other inputs because of its sound degrading qualities...."