Intermittent low hum/buzz
I know this has been covered here on these forums before but I gotta throw it out there one more time . So heres the set up , a dedicated 20 amp circuit on a full space breaker (not a split) so no shared neutral ,number 12 romex into a plastic box which I never use but I figured it would be best for what Im doing here then finally a hospital grade Isolated ground receptacle.All the cables both AC and signal are all either AQ, Kimber or Acustic Zen ,power conditioner is Torus model 15, power amp Prima Luna evo 400 ,pre amp Prima Luna evo 200 ,sources Aurender A100 ,anolog is Gold note phono pre and Planar 6 turntable with a moving coil cart.So that all seems pretty legit to me so why in the hell do I have this intermittent low level hum or really maybe more of a buzz In the mid range driver? ,oh speakers are Focal Kanta 2,s You have to put your ear right up to the speakers to here it but it’s driving me crazy ,Thanks in advance.
Tinnitus is caused internally by the auditory and nervous systems, without any external stimuli. While some people perceive us as a form of low-frequency tenets, such as Venus We, some report that it is not internal, worse from the outside inside their homes. Regards: Printers Insider |
I spent several days digging out the last bit of hum from my system. Believe me, any hum at all will degrade the sound at some level. I found I had to not only tie all my electrical cords to the same Earth point but I also had to put ferrite beads on some power cables since that hf hash came through as a low level hum. Shielded power cables are a must but frankly, distance is your best friend. Separate the analog power and digital power cables, and keep both well separated from any interconnects. Pay attention to what is in your rack, some of the hum coupled through the space between shelves from noisy amplifiers and injected it into susceptible components above and below the noise source. |
Thx spatialking,Im inclined to think thats right, the last thing I did was change out the only remaining stock AC cable this week (no joy) but over the years component’s have have been changed out and moved with no real overall plan for cable runs and placement. My thinking is to tear down the entire system down after building a longer and deeper shelf,the whole system sits on a free floating shelf.A good portion of the original cabling was run thru chases inside the walls for a clean look and that also helped with keeping the AC from running to close to interconnects. If nothing else it’ll at least make me feel like Im working on it. |
It could be a signal tube with dirty and or corroded tube pin(s) to tube socket contact(s) connection(s). Pull each signal tube then plug it back in repeating the process a few times. This will clean the tube pins to tube socket contact connection. You could try just the preamp first and see if that solves the problem. If not do the signal tubes on the power amp. . |
