2. amps-preamps
  3. 1203912430

Ground Loop Hum

I own a McIntosh MC240. Recently I needed to have the original power cord replaced and figured why not replace it with a 3 prong grounded cord while I'm at it. Only problem was when I hooked it up to my pre amp [MFA Magus] I got hummmmm. I've been getting around it by using a 3 prong to 2 prong adapter on my pre amp. That stopped the hum, but I've always felt uneasy about not having the unit grounded.
My question is, is there a simple, cost effective way to get rid of ground loop hum while still keeping my amp & pre amp grounded?
If not, which unit is better off grounded, or does it make a difference?
Thanks in advance for any recommendations.
opal

Showing 1 response by sugarbrie

sugarbrie
3,854 posts
 
You do not want to lift the AC ground on your preamp. All of your sources are grounded to it.

Lifting the ground on the amplifier is perfectly fine. That is why the OEM power cord that came with your amplifier is only 2 prong to begin with.

If you want to upgrade the power cord to the amplifier, then disconnect the ground wire in the male AC plug.
More to discover