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grounding SUT question

110.22.30.200
Posted on August 27, 2016 at 23:33:56
Heifetz
Audiophile

Posts: 245
Location: Melbourne, Australia
Joined: April 3, 2013
 Sorry for such a basic question and would appreciate some help -
I have a new SUT and there is a slight hum in my system. There is a ground connection on the SUT. To ground it, do I just simply connect a thin wire from the SUT ground connection to the ground connection on my phono stage or the preamp or power amp ?
I'm not too good with the electronics side of things but I do know that sticking into the ground may not help much - or may be I'm wrong ?? Any photos or images to help explain?
Thx, Bob
"You have to leave something to your imagination"

 

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RE: grounding SUT question, posted on August 28, 2016 at 00:18:03
goldenthal
Audiophile

Posts: 1001
Location: Ontario
Joined: March 28, 2003
 I am no expert, and my experience is limited in that over the decades my pre-amps have all had built-in phono stages, but a wire from sut to pre-amp ground usually (but not always -- the exception was an early Bryston sut) has worked for me That said, I'm not sure you can hurt your system by trying different arrangements, especially if you start low and bring the volume up gradually to check for hum.


Good luck,

Jeremy

 

SUT, posted on August 28, 2016 at 01:26:12
Frihed89
Audiophile

Posts: 15703
Location: Copenhagen
Joined: March 21, 2005



A Danish "SUT", Plugged in and earth grounded

 

RE: grounding SUT question, posted on August 28, 2016 at 06:02:29
bcowen
Audiophile

Posts: 1076
Location: North Carolina
Joined: December 19, 2015
 Best arrangement is to hook the ground wire from the SUT ground connection to the phono preamp ground (where you attach your tonearm wire ground). It may not solve the problem, but is easy and cheap enough to try. I'd use a decent gauge of wire (18 gauge or heavier) rather than a "thin" wire.

 

RE: grounding SUT question, posted on August 28, 2016 at 07:56:30
John Elison
Audiophile

Posts: 23900
Location: Central Kentucky
Joined: December 20, 2000
Contributor
  Since: January 29, 2004
 I run my turntable ground wire to my SUT and then another ground wire from SUT to phono stage. I use wires with alligator clips that I bought at Radio Shack. They make it easy to try different grounding configurations.


 

RE: grounding SUT question, posted on August 28, 2016 at 08:26:41
Tre'
Industry Professional

Posts: 17298
Location: So. Cal.
Joined: February 9, 2002
 Most SUTs have a ground lug meant to be used to connect the ground wire from the turntable.

That ground lug is also usually connected to the ground of both the left and right output connectors.

So in most cases the SUT is already grounded to the preamp.

SUTs can pick up hum if they are close to a source of hum like the power supply in the preamp.


Try moving the SUT as far away from any possible source of hum as you can.


Tre'



Have Fun and Enjoy the Music
"Still Working the Problem"

 

+1 on that grounding arrangement. , posted on August 28, 2016 at 14:59:12
Mick Wolfe
Audiophile

Posts: 3364
Location: AZ
Joined: October 10, 1999
Contributor
  Since: September 4, 2000
 NT

 

I think this one is the way to go but....., posted on August 28, 2016 at 15:28:36
Tre'
Industry Professional

Posts: 17298
Location: So. Cal.
Joined: February 9, 2002



you need to have two, two conductor shielded tonearm cables with a separate ground wire.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

 

RE: grounding SUT question, posted on August 28, 2016 at 19:40:46
neolith
Audiophile

Posts: 4842
Location: Virginia
Joined: February 21, 2002
Contributor
  Since: December 2, 2004
 Also try rotating the SUT to different orientations.



"Our head is round in order to allow our thoughts to change direction." Francis Picabia

 

RE: + 1/2! , posted on August 30, 2016 at 18:29:24
kitch29
 Trial and error is 1/2 the key, there's all sorts of RF and magnetic garbage out there and no one configuration will solve it.

The other 1/2 is shielded cables from TT to SUT to Phono stage. Don't fall for the 'shielded cables don't sound good' B.S.

 

RE: + 1/2! , posted on August 30, 2016 at 21:47:08
John Elison
Audiophile

Posts: 23900
Location: Central Kentucky
Joined: December 20, 2000
Contributor
  Since: January 29, 2004
 Thanks for the advice! Yes, I use shielded cables throughout my system and especially in both of my vinyl front-ends. My system is pretty much devoid of noise and hum. I couldn't be happier, especially now that I just installed Rythmik Servo Subs right beside my main speakers. The subs integrate seamlessly providing full-range sound with tight, fast, deep bass.

Thanks again,
John Elison


 

RE: You're in Kentucky...shouldn't the fireplace cover be blue?, posted on August 31, 2016 at 09:32:49
kitch29
 Good looking system.

Solid state and Thiels "pretty much devoid of hum"? HT lines nearby?

The Aikido based pre should be quiet; my John Broskie Aikido boards unit is although it took some doing, like the mic cable output wires.



Quieter still, even with the notoriously microphonic 76s, is this JE Labs based pre, my daily driver. Gaskets for the tube sockets, shielded input and output wiring, lotsa chokes and careful shoe-horning of the circuit into the smallish chassis did the job.






 

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