OK so I've had a Mani for about a year now. About 3 weeks ago, I started hearing major radio interference in my speakers. I mean, I can clearly pickup the local radio station with the preamp on and no vinyl playing. There's barely any static, it's almost a clear radio signal. Grabbed a cheapo generic preamp I had laying around and plugged it in, and NO FEEDBACK at all. Pop the Mani back in and feedback again. Emailed Schiit but they didn't really help much other than the normal suggestions (check the gain settings, make sure cables are shielded). I've tried every gain setting and replaced the cables still no help. Even tried plugging into another wall outlet. I returned the unit back to Schiit and grabbed a new one. STILL getting the feedback. I must add, I have a DP-300F and my turntable does not offer a ground wire, but as I mentioned that shouldn't be it because it's always been dead quiet and never needed it before. If this can't be resolved, I'm looking for phono preamp suggestions in the $150 range.