Are SSC interconnects screened?

All things NVA
User avatar
zebbo
Posts: 1448
Joined: Thu Jul 12, 2012 8:22 am
Location: As close to France as you can get.
Great Britain

Re: Are SSC interconnects screened?

Unread post by zebbo » Sun Apr 15, 2018 6:41 pm

Ok, I have now tried all the supplies and my findings are that:
While all the supplies work absolutely fine electrically and musically, two of them cause the speakers to buzz with SSC phono cables attached while the other two operate the speakers totally silently, (I'm listening to the top sections now with no buzzing at all).

Buzzing only occurs when a phono cable is attached. If no phono cable is attached the speakers are silent.
So two of the supplies seem to be causing interference with the unshielded SSC interconnects and two are not.
Applemarc used TIS interconnects are they shielded ? If so he would never have noticed.
Audio Grail "Sable" Garrard 401 with constrained layer plinth / SME V / Allnic Puritas LOMC, Phono 3 + 2X BBPSU - MEGA!, NVA P90sa, NVA Cubix-Pro, (top & mid sections). (Oh and a Pioneer BDP LX70A when I just want some background music!)

User avatar
zebbo
Posts: 1448
Joined: Thu Jul 12, 2012 8:22 am
Location: As close to France as you can get.
Great Britain

Re: Are SSC interconnects screened?

Unread post by zebbo » Sun Apr 15, 2018 6:43 pm

No worries Marc. As far as I'm concerned I bought them so any issues are now my issues. :)
Audio Grail "Sable" Garrard 401 with constrained layer plinth / SME V / Allnic Puritas LOMC, Phono 3 + 2X BBPSU - MEGA!, NVA P90sa, NVA Cubix-Pro, (top & mid sections). (Oh and a Pioneer BDP LX70A when I just want some background music!)

User avatar
Classicrock
Posts: 1896
Joined: Sun Apr 07, 2013 12:51 pm
Location: Bristol
Great Britain

Re: Are SSC interconnects screened?

Unread post by Classicrock » Sun Apr 15, 2018 6:48 pm

Sounds like a bad connection on the amp cable terminals. I think NVA shielding itself is not connected and works on faraday cage principle. Have you another phono cable that can be tried which would isolate it to the amp if still buzzing?

User avatar
zebbo
Posts: 1448
Joined: Thu Jul 12, 2012 8:22 am
Location: As close to France as you can get.
Great Britain

Re: Are SSC interconnects screened?

Unread post by zebbo » Sun Apr 15, 2018 6:57 pm

With the two power supplies I'm using at the moment, (I can only use one section of the speakers at the moment as I only have one pair of cables), there is absolutely no buzzing at all so it's not a fault with the cables per se. If I were to run from the other two supplies the speakers buzz when the phonos are attached.
Audio Grail "Sable" Garrard 401 with constrained layer plinth / SME V / Allnic Puritas LOMC, Phono 3 + 2X BBPSU - MEGA!, NVA P90sa, NVA Cubix-Pro, (top & mid sections). (Oh and a Pioneer BDP LX70A when I just want some background music!)

User avatar
Classicrock
Posts: 1896
Joined: Sun Apr 07, 2013 12:51 pm
Location: Bristol
Great Britain

Re: Are SSC interconnects screened?

Unread post by Classicrock » Sun Apr 15, 2018 7:23 pm

So it is when the 2 offending power supplies are attached? If so the connectors on the power cables may have developed a fault when being dismantled / transported.

User avatar
zebbo
Posts: 1448
Joined: Thu Jul 12, 2012 8:22 am
Location: As close to France as you can get.
Great Britain

Re: Are SSC interconnects screened?

Unread post by zebbo » Sun Apr 15, 2018 8:43 pm

I don't think so because the amps/speakers work fine musically with any of the supplies but two of them cause the buzz, (stray EMF / RFI or whatever ?), which seems to be picked up by the interconnects.
Audio Grail "Sable" Garrard 401 with constrained layer plinth / SME V / Allnic Puritas LOMC, Phono 3 + 2X BBPSU - MEGA!, NVA P90sa, NVA Cubix-Pro, (top & mid sections). (Oh and a Pioneer BDP LX70A when I just want some background music!)

User avatar
zebbo
Posts: 1448
Joined: Thu Jul 12, 2012 8:22 am
Location: As close to France as you can get.
Great Britain

Re: Are SSC interconnects screened?

Unread post by zebbo » Sat Apr 21, 2018 9:20 am

Well, cheapo shielded cables arrived and I hooked them up. Result? The buzz is reduced by, probably around 40 - 50% but still there.
If I make sure that the lower speaker, (with the driver inside the cabinet), is the one running from the buzzy PSU then it's barely audible but it's still strange.
Audio Grail "Sable" Garrard 401 with constrained layer plinth / SME V / Allnic Puritas LOMC, Phono 3 + 2X BBPSU - MEGA!, NVA P90sa, NVA Cubix-Pro, (top & mid sections). (Oh and a Pioneer BDP LX70A when I just want some background music!)

User avatar
Dr Bunsen Honeydew
Posts: 28246
Joined: Wed Jul 11, 2012 7:26 pm
Location: Muppet Labs
Great Britain

Re: Are SSC interconnects screened?

Unread post by Dr Bunsen Honeydew » Sat Apr 21, 2018 9:34 am

I can build versions of SSC and SSP and TIS with the Faraday Cage configured as a screen. Existing ones can't be converted. PM me about bringing the one back that needs work.

User avatar
zebbo
Posts: 1448
Joined: Thu Jul 12, 2012 8:22 am
Location: As close to France as you can get.
Great Britain

Re: Are SSC interconnects screened?

Unread post by zebbo » Sat Apr 21, 2018 4:15 pm

Bloody earth loop. Disconnected the earths on the two PSU's and now all is silent.
Audio Grail "Sable" Garrard 401 with constrained layer plinth / SME V / Allnic Puritas LOMC, Phono 3 + 2X BBPSU - MEGA!, NVA P90sa, NVA Cubix-Pro, (top & mid sections). (Oh and a Pioneer BDP LX70A when I just want some background music!)

User avatar
applemarc
Posts: 569
Joined: Wed Jul 11, 2012 7:42 pm
Location: Gidea Park Essex
Great Britain

Re: Are SSC interconnects screened?

Unread post by applemarc » Sat Apr 21, 2018 6:42 pm

Oh the joy's of our hobby
SME30,SME V,Koetsu Jade Diamond, Balanced Audio Technology VK-D5SE SUPER PAK cd player,NVA TCS/TAS,Wadia 171 Beresford Caiman Ipod

Post Reply