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Hum with Ypsilon MC26L SUT that goes away with touching

I need help solving the hum problem.

Ikeda Kai cartridge -> Ypsilon MC26L SUT -> Ypsilon VPS 100 -> Cary SLP 05 -> Cary CAD 211FE monoblocks -> KEF Blade.
ICs between MC26L and VPS100 Stage 3 concepts RCA
ICs between VPS100 and  Cary SLP 05 Stage 3 concepts XLR
Cary SLP 05 and Cary monoblocks Shunyata RCA
Cary monoblocks to KEF Blade Shunyata speaker cables.

Connected ground from tonearm phonocable to SUT grounding post ->I hear 60 hz hum
Connected ground from tonearm phonocable to SUT grounding post + connected  SUT grounding post to VPS 100 ground ->I hear 60 hz hum (slightly decreased)
Connected ground from tonearm phonocable directly to VPS 100 ground (I read in the forums to try this) ->  I hear 60 hz hum
If I touch the body of SUT (metal) with one hand and touch the metal frame of the rack that sits directly on the floor, the hum disappears in all the above situations.

I used two shorting RCA plugs into input loading of SUT with tonearm cable connected to input-> No Hum 
I used two shorting RCA plugs into input of SUT without tonearm cable-> No Hum
I used two shorting RCA plugs into output loading of SUT -> No Hum

Any help in solving this hum problem is greatly appreciated.

Thanks
Kanchi
kanchi647

Showing 1 response by rauliruegas

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rauliruegas
12,779 posts
 
Dear @kanchi647 : two things, first and to avoid ground loops we need to have a dedicated true ground connection ( this means a 2-3m. cooper solid tube underwround and touching a combination of salt and other ingredients and then atached to it a heavy cooper wire/cable. ) that will be connected directly to the phonolinepreamp and all electronicswill be be grounded to this item and your TT/SUT/TOnearm must has a ground wire to the phonolinepreamp. 

The second thing you need to do it’s to take out your cartridge and clean perfectly its output pin connectors and when you reconnected to the tonearm wires stay totally sure that the tonearm wire connectors makes a tigth connection into the cartridge output pin connectors.

Yes you have to clean any single input/output connector in your system and that at each connection it makes tigth connection.

Now your Kai cartridge has a low output level of 0.19mv along very low internal resistance of 2.5 ohms.
For me that cartridge will be better served with an active high gain phonolinepreamps than a SUT but this is only additional of what I writed here and obviously does not helps to your today issue.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.


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