I have an Eros Phono pre-amp and a Stereomour II and today, while listening to Metallica’s “...And Justice For Allâ€, at a volume worthy of listening to this LP, I started hearing a loud ringing in my system. Could this be caused by sympathetic vibrations of the tubes (it seemed worse when there was a lot of palm muting on the guitar track)? Or is it simply feedback through my Ortophon red? Either way, does anyone have any tips to quiet the ringing? Thanks!