Wondering if any other Eden users have had this, and hoping for glory. Last night my head made some random high pitch whistling sound. It was a high traffic RF area, but I bypassed my wireless and it happened again. Get this...turned down my gain and it remained...that part scares me. All the guitar heads in the joint were talking tube problem, but the track record on a tube problem for Eden says otherwise. Any help is much appreciated. Cheers All!!