Hum with TAK CU phono cable


Bought used TAK CU kimber rca to rca phono cable with its dedicated ground . When I inserted on my Ned Clayton step up transformer output to parasound jc3 plus it started humming, my turntable is a rega planar 2 with fixed rca cables and my understanding Rega grounds its tables through the left channel. Kimber specifies that this cable is shielded, I have not connected its dedicated ground cables as I don’t want to cause other ground loops .Does anyone have experience with this Kimber TAK CU cable , I love the sound I am getting from this cable but not the hum , don’t mind putting my Mogami 2549 cable back in as it has a good sound as well . Any info would be appreciated 

chrisocr

When it comes to phono hum, you just have to experiment. Especially with a SUT in the mix. I have a couple of the Pangea ground cables hanging around because they're good quality, and it's good to experiment with a free ground cable. 

Turn your system on, mute off, put volume to a low-ish reasonable level so you can *just* hear the problem hum (lower than usual listening level - you don't want to cause any nasty high-level pops) and firmly but loosely (just contact-based) connect the ground cable to various contact points to see if you can find the magic quiet configuration. 

With my SOTA table I need to use the DIN phono cables's integrated ground (to arm) PLUS a separate ground cable tied to table chassis/bearing - both then tied to SUT on other end. When I had an RCA / RCA phono cable with separate integrated ground (spades on both ends - probably just like your cable), coming out of SUT, it was always a mixed bag:

  • Sometimes tying both spades (SUT and phono input) was quietest
  • Sometimes tying neither spade worked
  • Sometimes typing ONE end (usually SUT side) worked best. This is generally a "best bet" and replicates the typical shielded RCA cable having its shield tied to ground on SOURCE end only (arrows point AWAY from source end). The SUT chassis becomes the main ground reference in this scheme

Thank you all , I really love the sound of the kimber , it’s something I will have to I I will have to get use to the small amount of hum. 

Also if you have your phono stage plugged into another circuit from where your preamp or integrated amp draws power, it may cause hum due to ground loop. 

@chrisocr have you tried what I suggested above? To have the phono stage run out of the same outlet/circuit as your preamp or integrated? That’s should clear out the hum. 

Yes I have , I apologize for late response and makes total sense, my turntable was connected to a separate source , so i joined the TT , phono preamp , preamp together with my power amp circuit. Did help , still slight hum and I think that’s the best it will be for now , I can live with it as I truly enjoy this cable compared to my Mogami . I believe since I am using a step transformer the 20:1 gain I am using with my denon 103r make the hum more audible at higher volume but in reality it’s way over my normal listening volume , at my normal listening volume which is plenty , the hum is hardly there. Kimber although says this cable has shielding, it seems it has less than average and it relies heavy on their special braiding technique to reject RF noise . But all in all I’m happy , thank you , I am new to these forums and very impressed with the support from the Audiophile community, applause 👏 from my end to you .