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Occasional hum

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    Posted: 20 Dec 2023 at 4:29pm
Glad it worked out.
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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Post Options Post Options   Thanks (1) Thanks(1)   Quote RichW Quote  Post ReplyReply Direct Link To This Post Posted: 19 Dec 2023 at 8:13am
Well done for sorting out the problem Kevin.


Majestic/Enigma, Accession MM & MC.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 16 Dec 2023 at 3:55pm
Well done and thank you for sharing.
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote CageyH Quote  Post ReplyReply Direct Link To This Post Posted: 16 Dec 2023 at 2:23pm
It has been about an hour since I made my changes. 
I have not had the faintest sign of the hum.

I think I can put this subject to bed, and move on. Thumbs Up
Kevin
European loan coordinator, based near Toulouse, France.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote BackinBlack Quote  Post ReplyReply Direct Link To This Post Posted: 16 Dec 2023 at 1:37pm
Glad to know that you're getting somewhere near solving the problem. Earth loops/pickup can be so difficult to isolate. I find that turntables are the worst culprit, earthing arrangements can be so haphazard, or even non existant.

Happy Listening
Ian
Just listen, if it sounds good to you, enjoy it.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote CageyH Quote  Post ReplyReply Direct Link To This Post Posted: 16 Dec 2023 at 1:22pm
I have altered the earthing scheme and cable layout, and have managed to reduce the hum significantly.
It seems that it was either an earth loop, or loop pick up.
It is not perfect, but I will do a better job in the Christmas holidays.
Kevin
European loan coordinator, based near Toulouse, France.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote CageyH Quote  Post ReplyReply Direct Link To This Post Posted: 16 Dec 2023 at 10:20am
Playing around with Audacity, I have managed to produce a plot, that confirms it is mains related:

There is a noise at 50Hz and a bigger one at 100Hz.
I guess I don't have many option of filtering this 100Hz noise out?

It makes me wonder if this is ground loop related, and if so would a mains isolation transformer help?

Kevin
European loan coordinator, based near Toulouse, France.
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