Sorry to jump in. I have a question for Bob_bundus and Fpeel. I have experienced "ground Loop" and I think I have tamed it by MAGIC and/or chater plug (MAGIC lost some channel resection and did not completely got rid of the constant baxx). This means that the system is now very quiet at volume zero. However, I still have another buzz which emerges and increases with the volume-up. At maximum volume with no source, the buzz (definitely NOT humm or hiss) is audible from about 2 feet away. Was the buzz some of you have solved this sort? And, Bob, would using "Grounding Block" and connecting Cable TV's ground to AC outlet ground solve this? My system is tube power (70 wpc) and passive pre drivnig 87 db sensitivity speakers, using very shielded IC between power and pre. The buzz is the same level from both channels. It exists even with no source connected. The manufacturer (CJ) claims that "the noise which varies with volume is not amp problem. If it's not audible at normal situation, that should not be a problem." I half agree. But it still concerns me.
Thank you for your help. Ken
Thank you for your help. Ken