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Turntables and Hum |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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You've heard the saying "it takes a man to admit..." (apologies to the woke reader)
Please can you verify which I think I might have read "I don’t use shielded interconnects" This is not to ridicule you in any way, but you will have been the first ever to man-up. And it is very important that we see this in the context of getting any system to behave properly. |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Pushpaw
Senior Member Joined: 25 Jul 2020 Location: Canada Status: Offline Points: 109 |
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yes it is very true. I don’t use shielded interconnects and I’m not afraid to say it. Has always been part of the plan to acquire some but haven’t pulled the trigger yet.
I’ll make 2021 the year of the Shield.
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P******t Debut Carbon, Goldring 1042, GS Accession MM w/Enigma, GS Solo ULDE w/PSU1, Sennheiser HD6XX, Technics SU-800 IA, Castle Knight 1, PS Audio Ultimate Outlet, Lautus & CuSat50
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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David, you have done high fidelity a massive favour - a much needed reset from the propagandists who have brought so much displeasure - those working the rot from the inside which has done so much harm to our extremely important recreational activity. The times I have been accused of making noisy products by people using unshielded interconnects is more than enough to test any man's resolve. Thank you.
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Pushpaw
Senior Member Joined: 25 Jul 2020 Location: Canada Status: Offline Points: 109 |
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I finally got some shielded cables - Lautus and some CuSat50. Interestingly I discovered that the RF noise in my system from the nearby dimmer switches is not entering through any of the components or cables. It’s coming through the turntable. I’ve been reading your posts about improper grounding on modern TTs and I think I’m the owner of such a TT. I believe it’s the TT because when I plugged a digital source into the ULDE the dimmer switch hum went away completely.
And when I unplugged TT but kept ULDE switched to input from the TT (just the Lautus cable) there was not RF noise. So I will need to upgrade my TT to get rid of this. Question: how do I know which TT brands are properly grounded and/or shielded?
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P******t Debut Carbon, Goldring 1042, GS Accession MM w/Enigma, GS Solo ULDE w/PSU1, Sennheiser HD6XX, Technics SU-800 IA, Castle Knight 1, PS Audio Ultimate Outlet, Lautus & CuSat50
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patientot
Senior Member Joined: 28 Nov 2018 Location: USA Status: Offline Points: 1525 |
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I can tell you that Technics turntables, assuming you're not talking about one that someone butchered, are usually properly grounded. Never had grounding problems with vintage JVC or Yamaha decks either. Of course they all had regular ground wires and metal tonearms. A friend had one of those PJs and it definitely had a grounding issue, among other issues. My 2 cents.
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SL-1200 MK7 (modified) + Reflex M + PSU-1 used with AT150-40ML, AT VM95ML, Stanton 680mkII + Ogura, and Shure M35X cartridges.
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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In my experience, the culprit is usually the tone-arm "wand" - the waggly bit with the cartridge on the end - often, the mounting base is fine.
The Technics "wand," for example, has five "cartridge" wires inside. The black wire connects into the headshell adapter fitting, then runs the length of the "wand" along with the four cartridge wires. All five wires then thread through below the bearing block, down into the arm base. Fitted inside the arm base is a small, simple printed circuit board with lands to which the wires are soldered, and opposite, the shielded cables attach, and the black arm "earth" wire. As a result, there is electrical continuity all the way. Contrast that with "hi-fi" arms. I don't see many/any with the fifth wire. So how do they ground out the "wand"? The only possible connection is the mechanical connection, which is the arm bearings (or single bearing on a uni-pivot). But bearings need to be lubricated, or they'll seize! A grease or oil film gets applied at manufacture, and somehow, the circuit ground conducts through that? If it does conduct, it conducts poorly. But it gets worse. Carbon fibre is now the fashion, but as every car mechanic knows, it's resistive! If something is resistive, it doesn't conduct very well, but to "ground-out," it needs to conduct! So why would they do this? Sound-effects! The ethereality - the not to be of this world! Right on the knife-edge between stability and instability lies a "wonderful world" of "projected imagery." As one user was overheard to comment, "you could almost touch the electrons in the air as I was listening last night." That was met with nods and smiles by the (unnamed) company owner. I have a suggestion: try lysergic acid diethylamide! I am told it is far cheaper than boutique hi-fi and makes any system sound out of this world! Even if you don't have a system! Even the old BSR and Garrard consumer turntables had properly grounded arms. |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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CageyH
Senior Member Joined: 30 Apr 2012 Location: Toulouse, Franc Status: Offline Points: 1678 |
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Personally, I find a wee dram of single malt makes my system sound better.
But my modufied HiFi(?) arm containing carbon fibre is grounded, as the Technics methodology has been kept.
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Kevin
European loan coordinator, based near Toulouse, France. |
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