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01-07-2007, 06:58 PM
| | Junior Member Windows Movie Maker | | | Join Date: Jan 2007
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I have just upgraded my audio system. I'm old enough to have lots of old LP's which I raid for background music. My Turntable hooked into my new digital tuner amp has a loud mains 50 cycle hum.
I remember advice to provide a common earth between the turntable and amp to suppress this. My problem is that the Turntable mains lead is only 2 core (no earth wire). Any suggestions as to where on turntable chassis or pick up arm I connect to provide a common earth and hopefully get rid of the hum. It was virtually inaudible through the old (20 yrs tuner amp).
Thanks Jim j
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01-08-2007, 08:41 AM
|  | Senior Member Mr Crane Man | | | Join Date: Jan 2005 Location: Retford, Nottinghamshire.
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There is normally a thumbwheel connector both on amp and turntable to connect the lead to. Most amps that have a turntable ('Phono') input have the earth connector, but not all. I have previously loosened a screw on the cover (assuming it is metal) and attached there and the same on the turntable. Failing an external place to attach, you'll need to take it to bits and locate to the chassis.
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01-08-2007, 02:49 PM
|  | Opinionated Moderator | | | Join Date: Nov 2005 Location: Bristol uk
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When i was a hi fi nut I had a special turntable earth that was a copper pipe baged into the dirt - and i had a dedicated mains spur for the amps - but that was all going a bit far in retrospect - as TM says there should be a small earth screw on the amp, or try a chassis screw. These earth hums can be a nightmare sometimes...
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01-08-2007, 06:43 PM
|  | Administrator | | | Join Date: Nov 2003 Location: Kent
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Are you guys speaking English?
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01-08-2007, 08:01 PM
| | Senior Member Mr Crane Man | | | Join Date: Jan 2005 Location: Retford, Nottinghamshire.
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Originally Posted by Marc Peters  Are you guys speaking English? |
I sometimes think the same when you lot start going on about benchmarks and gigawhotsits...  Mark and I obviously date from an age when you had to do things for yourself.....
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01-11-2007, 10:57 PM
| | Senior Member Video Editing Junkie | | | Join Date: Jul 2005 Location: Bladon
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I would say im a semi expert at sound, But i dont understand either:S
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01-12-2007, 09:45 AM
| | Senior Member R=E([K/N]A)+W | | | Join Date: Mar 2005
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You hum it... I'll find the ground loop.
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