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Occasional hum |
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CageyH
Senior Member Joined: 30 Apr 2012 Location: Toulouse, Franc Status: Offline Points: 1678 |
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I think it is power related.
Out of desperation, I fitted ferrite beads on the internal power cables inside my phono stage, and the noise has dropped dramatically. I am hard pushed to hear it at normal listening levels (without music playing) so I have bought an Isotek power filter to see if that will help.
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Kevin
European loan coordinator, based near Toulouse, France. |
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CageyH
Senior Member Joined: 30 Apr 2012 Location: Toulouse, Franc Status: Offline Points: 1678 |
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The even simpler solution has been found. Just disconnect the grounding cable from the phono stage.
Why did I not think of this earlier? Why, because it still hums…. Digital is so much easier.
Edited by CageyH - 26 Mar 2023 at 9:31am |
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Kevin
European loan coordinator, based near Toulouse, France. |
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Chris Firth
Moderator Group Joined: 16 May 2013 Location: Rossendale, UK Status: Offline Points: 1529 |
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CageyH
Senior Member Joined: 30 Apr 2012 Location: Toulouse, Franc Status: Offline Points: 1678 |
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The phono stage is connected to the mains, as is the pre and the power.
Yes, I have AKs modified arm, with an aluminium arm tube. I have just made a new grounding lead, with a floating shield. It has been plugged in for 15 minutes, and no signs of a hum. It may not be the theoretically optimal solution, but if it works, who cares?
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Kevin
European loan coordinator, based near Toulouse, France. |
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Chris Firth
Moderator Group Joined: 16 May 2013 Location: Rossendale, UK Status: Offline Points: 1529 |
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Is there anything with a mains ground connected in your audio system?
Hook it up to there. You posted before I finished typing. Something else crossed my mind. Are you still using AK's modified arm, and what is the arm tube made of? Edited by Chris Firth - 25 Mar 2023 at 10:58am |
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CageyH
Senior Member Joined: 30 Apr 2012 Location: Toulouse, Franc Status: Offline Points: 1678 |
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So if I grounded the shield to the mains earth, with a fly lead, would it work?
I am going to try a couple of ferrites (of the correct size) first, and then look at other options. I may try removing the lead altogether, but so far, ferrites seem to be the answer.
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Kevin
European loan coordinator, based near Toulouse, France. |
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Chris Firth
Moderator Group Joined: 16 May 2013 Location: Rossendale, UK Status: Offline Points: 1529 |
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Radio Hams might run something outside and into the ground.
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