RE: Phono hum and how to fix it

Posted by SteveBrown (A) on December 19, 2014 at 08:17:20

In Reply to: Phono hum and how to fix it posted by Mcmann57 on December 19, 2014 at 06:33:45:

I may be wrong, but I though the sheild of either the left or right channel was connected to the arm. You can check easily enough with an ohm meter. Hum can be a real bear to track down. I chashed it all over one time and finally found that a shielded AC cord to the phono pre was the answer. On your Mac, since it doesn't use a 3-wire cord, try unplugging it and reversing it in the socket (e.g. rotate 180 degrees and plug back in).

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Follow Ups Full Thread

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)

Follow Ups

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

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