Intermittent low hum/buzz

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.

I don’t think the Planar 6’s tonearm is grounded. Give that a shot. Ground from your stage to the tonearm and/or drive motor.

@bikeboy52 ,

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.

.

Thx ,Jea48 I found it today (again) I swapped out the rca interconnects between the pre amp and the power amp. They’re was a pair of Kimbers in there before and I switched them out for an old budget pair of Adioquests. So possibly its a shielding thing the Kimbers have none or its caused by the cables being run through the wall or both.The home run circuit that powers the system is not running anywhere near this space but there is one or more existing circuits in that wall between the family room and the master bedroom.I just ran those Adioquests outside the wall as a quick test so I don’t really know for sure yet or I could be completely out to lunch on the whole theory because it’s intermittent, It’s frustrating, thats why I say “ I found it again “ I’ve been into Hi Fi since I was a teen but only vacum tubes for three years or so I’ve got a complete solid state system as well so I could also change out the pre and power amps to rule those out per your suggestion also ,thx again Jea48.