@chervokas I am not going to go through and answer because I am finding serious discrepancies in my observations on a daily basis . I have started fresh today and below are my findings while trying to isolate every variable as best as I can... Ok. I just ran an initial test. This is where things get wacky because it seems there has yet to be a constant set of parameters to reproduce the problem. What I can isolate it to one day changes when I revisit this problem on the next day. I feel like Clark Griswold chasing his tail in trying to trace the power interruption in his Christmas lights! So, my test this morning. I unplugged everything. My line conditioner, power strip and everything from the power strip. I then plugged my amp directly into the wall socket with nothing else. SILENCE on all inputs. Complete silence, no hum, nothing. Yesterday I was receiving hum on my two active inputs while everything was powered off except the amp, but all plugged in to the power strip with the line conditioner engaged. In fact, my DAC was unplugged while its input was picking up hum. This hum went away when the interconnects were pulled from the amp. Ok, back to today's test. Amp plugged directly into wall with everything else unplugged = no hum on all inputs. Then I plugged my phono pre into the other outlet (still powered "off"), and there is a very low-level hum/buzz present on both inputs with volume at max. I powered it on and...BZZZZZZZZZZZZZ! That hum/buzz gets magnified, as I would expect. Again, this is at high volumes only. My phono pre is set to 45dB gain, loaded at 47KΩ and opF. Also, this buzzy hum increases with volume when I touch the exposed tonearm wires arcing from the back of tonearm to junction box. This buzzy hum virtually disappears when I touch the metal connector connecting the tonearm wires to the junction box or when I touch either metal interconnect lead coming out of the junction box. Test #2 Now I have plugged my power strip back in (Shunyata Venom PS8). I plugged only my amp into the strip and powered up. Silence on all channels (volume at max). I plugged my phono pre in, but not powered on, and I get the low-level buzz with volume at max (same as in test#1 above). This is on both engaged inputs (phono and DAC). Again, its not there when the phono pre is not plugged in. I unplugged the phono pre and the faint hum goes away. I power the phono pre "on" and, as expected, the buzzy hum is amplified considerably but only when the amp "phono" input is engaged. Buzz increases with volume when tonearm wire is touched and virtually disappears when tonearm wire connector or interconnect leads are touched. The other active input (DAC) stays the same with just the very very faint buzz. Note: When I pull the DAC interconnects from the amp, that very slight buzz mentioned in test#2 is replaced by a buzz of higher frequency, possibly even more faint, which is experienced on all disconnected inputs when amp is powered on, volume at max and my ear literally in the dish of the speaker's woofer. This is there whether phono pre is plugged in or not. However, this high freq buzz is not present on the phono input while the phono pre is unplugged and the interconnects are all plugged in. I am not sure if this amounts to anything, but it seems I need to note all observations. It sounds just like when a street light first fires up, but so very faint. I am not concerned with this particular buzz in my system because it seems like something that is inherent to the setup. Again, I thought it was worth mentioning if it helps diagnose the actual issue at hand. Thoughts? Ground issue with the phono pre?