| AR turntable [message #11947] |
Thu, 17 February 2005 19:17  |
David Teves
Messages: 2
Registered: May 2009
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Esquire |
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I have an AR turntable that develops a hum that begins when the tone arm is placed above the outer edge of the record. It is not very loud, but it is very annoying. Does anyone have a guess as to whether this is being caused by the tone arm or the cartridge? Or anything else? Thanks!
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| Re: AR turntable [message #11952 is a reply to message #11951] |
Fri, 18 February 2005 19:20  |
Manualblock
Messages: 4973
Registered: May 2009
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Illuminati (13th Degree) |
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Grado's are not shielded real well so they tend to hum in many tables. Not much you can do about that. Lots of people live with it, otherwise you need to swap carts.
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| Re: AR turntable [message #11953 is a reply to message #11952] |
Sat, 19 February 2005 05:51 |
Russellc
Messages: 397
Registered: May 2009
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Illuminati (1st Degree) |
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Not only is your grado not shielded, which in many applications is of no consequence, but more importantly the AR's motor is not shielded either, and it is making your system hum. I bet it gets worse as the arm moves closer to the center. Audio "lore" has long warned against mixing grados with ARS. That being said, it can be done either by getting your dealer to order a version (which they used to carry) that is less hum prone, or by shielding your table's motor. I have no experience with such shielding, but I have read posts where people used "mu metal" what ever that is. Apparently it is used in rf shielding. Russellc
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| Re: AR turntable [message #12063 is a reply to message #11952] |
Fri, 08 April 2005 20:49 |
Dominic
Messages: 29
Registered: May 2009
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Chancellor |
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I had a little lug on my cartridge that grounds the cartridge casing to the left ground lug (blue). sometimes it will stop the noise.
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