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tone

speaker hum from CD Transport/Phono pre amp proximity

5 posts in this topic

Hi
Looking for some help getting rid of some hum. Offending component would seem to be my Audiolab 8000 transport, which when on induces speaker hum through my Dino pre amp which is sitting directly on the transport. The Transport is on the lower shelf of a wall mounted Target twin shelf turnable bracket.

I like to keep the DINO on, but when playing the CD I get this hum.

I have put a granite chopping board in between the 2 and this seems to have reduced it. Any ideas as to what else I can do, apart from fix another shelf for the DINO far enough away so as to lose the hum?

thanks in advance
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[quote name='tone']Hi
Looking for some help getting rid of some hum. Offending component would seem to be my Audiolab 8000 transport, which when on induces speaker hum through my Dino pre amp which is sitting directly on the transport. The Transport is on the lower shelf of a wall mounted Target twin shelf turnable bracket.

I like to keep the DINO on, but when playing the CD I get this hum.

I have put a granite chopping board in between the 2 and this seems to have reduced it. Any ideas as to what else I can do, apart from fix another shelf for the DINO far enough away so as to lose the hum?

thanks in advance[/QUOTE]

are they BOTH earthed at the plug end ?

i had the same thing once, i ended up removing one of the 2 earths from the plugs, even tho its not ideal, it did fix it for me.

Sup to you though....
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[quote name='Voice_Coil']i had the same thing once, i ended up removing one of the 2 earths from the plugs, even tho its not ideal, it did fix it for me.[/QUOTE]

[SIZE="4"][COLOR="red"]DO NOT DO THIS[/COLOR][/SIZE]

More to the point, don't tell anyone else to do it. It's horrendously unsafe, and against the AUP on this site.

[EDIT] Link to the AUP. The relevant section is already highlighted in red:

[url]http://www.hifiwigwam.com/showthread.php?576-Acceptable-Usage-Policy[/url] [/EDIT]

BY FAR the safer option is to break the earth in one of the interconnects at the 'load' end. OK, so in theory you might suffer from a touch more RFI - the earth path being both longer and separated from the signal path - but it'll kill the ground loop hum stone dead without any danger of killing you or your family stone dead. I've had to do this with my PC soundcard's connection to my amp.

Anyway. In response to the original post, it rather sounds as though the noise pickup is caused by the leakage flux from the transformer in the transport coupling into the sensitive input stage of the Dino. It's not an earth loop - moving them relative to each other wouldn't affect an earth loop hum. The only real solution - as you found - is to separate the items, although a grounded alloy sheet between the two might help a little.
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