Phono hum and how to fix it

Posted by Mcmann57 (A) on December 19, 2014 at 06:33:45

I have noticed that my phono circuit tends to hum audibly, more so as volume increases. The music obscures it to some extent, but if you just raise the volume without a record playing you can really hear it, especially on the subwoofer. Turning off the sub reduces it, but it is still audible through the main speakers. Preamp is a McIntosh MX-130.
My table is a Roksan Xerxes X with a Rega RB900 arm. I understand that this arm does not have a dedicated ground wire to attach to the preamp chassis. I am thinking I will install a ground wire to the preamp and touch it to the tonearm to see if this has an effect.

Anyhow, isn't there a procedure for installing a ground wire on a Rega arm?

Thanks!

Postscript: I should add that it is almost entirely on the left channel.

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Topic - Phono hum and how to fix it - Mcmann57 06:33:45 12/19/14 (9)

RE: Phono hum and how to fix it - flood2 22:51:03 12/20/14 (2)

RE: Phono hum and how to fix it - Mcmann57 06:19:09 12/21/14 (1)

Ah. The amp was being ground looped by the ground connection on the phono power cord. - Ralph 09:33:12 12/22/14 (0)

first thing to do- swap the phono interconnect cables and see if the problem moves. - Ralph 08:59:55 12/19/14 (1)

You can also test with a jumper cord - CometCKO 06:55:58 12/20/14 (0)

RE: Phono hum and how to fix it - SteveBrown 08:17:20 12/19/14 (1)

RE: Phono hum and how to fix it - jupiterboy 09:13:36 12/19/14 (0)

RE: Phono hum and how to fix it - jupiterboy 07:00:36 12/19/14 (1)

RE: Phono hum and how to fix it - daniele_g 09:11:54 12/19/14 (0)

Phono hum and how to fix it

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