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CageyH wrote:
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Occasional hum |
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Chris Firth 
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Joined: 16 May 2013 Location: Rossendale, UK Status: Offline Points: 1433 |
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 Posted: 25 Mar 2023 at 10:54am |
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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
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Joined: 30 Apr 2012 Location: Toulouse, Franc Status: Offline Points: 1603 |
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Posted: 25 Mar 2023 at 12:53pm |
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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
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Joined: 16 May 2013 Location: Rossendale, UK Status: Offline Points: 1433 |
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Posted: 25 Mar 2023 at 12:59pm |
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CageyH
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Joined: 30 Apr 2012 Location: Toulouse, Franc Status: Offline Points: 1603 |
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Posted: 26 Mar 2023 at 9:29am |
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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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CageyH
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Joined: 30 Apr 2012 Location: Toulouse, Franc Status: Offline Points: 1603 |
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Posted: 29 Mar 2023 at 8:31pm |
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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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gwebster
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Joined: 04 Oct 2014 Location: Liss, UK Status: Offline Points: 175 |
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Posted: 30 Mar 2023 at 9:47am |
Is it worth swapping out your "lockdown special" valve hybrid phono stage and reinstating your previous solid state phono? As a valve unit, there is inherently more mains related guff floating about (heater, higher dc supply) in it.
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Inspire Apollo tt, O/L modded RB250, Ortofon 2M Black, Slee Different Approach inspired Phono, Putzeys Pre, Cusat, Raspberry Pi/Volumio, Bitzie, Self Load Invariant Power, Acoustic Energy AE509s
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CageyH
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Joined: 30 Apr 2012 Location: Toulouse, Franc Status: Offline Points: 1603 |
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Posted: 30 Mar 2023 at 10:09am |
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No can do.
I don’t own a SS phono stage. I do have plenty available, but they are not mine.  I am determined to fix the issue. I am a bit stubborn about these things. Hopefully it will be fixed at the weekend.
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Kevin
European loan coordinator, based near Toulouse, France. |
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