2. analog
  3. 1232660666

Grounding Hum

I recently got a new TT for Christmas. It's an MMF 2.2 LE. I think there's a grounding problem or something because there is a slight buzzing noise present. I looked through past threads on the topic here, but nothing seems to fit this situation. I've checked, and rechecked the connection between the TT, and the preamp. I've even used a Fluke voltmeter to check for continuity between the two. I've checked the headshell leads to the cartridge. All is well. Maybe it's the ground wire connection to the turntable itself? I've run out of options. Any ideas?
licoricepizza
licoricepizza OP
48 posts
 
I've tried every suggestion, but still no success. I've even tried "shielding" the preamp, the amp, and the TT with tinfoil. No luck. Any other suggestions? I'm scratching my head so much it may start to bleed.
ghstudio
141 posts
 
I had a hum coming thru my preamp from a little 12V transformer used to power something unrelated that was too close to the pre.....look around the unit for anything that might cause the problem. Also turn off any dimmer, automatic light sensor and flourescent fixtures anywhere in the house. (auto light sensors and dimmers can create havoc).
darosenb
49 posts
 
Is the IC that runs from your preamp to amp shielded? I recently had this same problem and discovered that it was said IC and not the TT ground. Switching to a different IC did the trick for me.
licoricepizza OP
48 posts
 
It's Monster Cable interconnect cable, if that helps. Besides taking the cable apart, is there a way to tell if it's shielded?
licoricepizza OP
48 posts
 
I finally (3+ days) figured out. I pass along this update in the hopes that it helps someone else out. The source of the hum wasn't grounding at all. It was airborne RF given off by a Kodak camera dock in a distant room. All I can figure is that the electrical circuit for that device went through a wall behind my stereo system.

A big thank you to all those that responded.
More to discover