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Turntable Hum

I've got an old Technics that is giving me fits...there's a slight hum present, that's there regardless of whethter the unit has a headshell attached or not, and regardless of whether it's AC power is plugged in. When I swing the arm across the platter, the hum varies from crackling and loud to nothing. It's not near a transformer or anything like that. Any ideas? I'm really perplexed by the behavior of the arm.
vanmeter
vanmeter OP
33 posts
 
No, I don't have two grounds run. I'll certainly try it, but I guess I ruled it out since the hum doesn't change when I unplug the unit.

We have a less-than-a-year old baby, so I'm not sure when the problem cropped up, since I don't get as much time as I used to. I'd love to be able to trace it to one event, but I can't.
nsgarch's avatar
nsgarch
2,517 posts
 
Try turning the plug over at the wall socket.
clamps200045c1
63 posts
 
Some turntables sing some hum, if they don't know the words...hmmmm
mthieme
74 posts
 
Could there be a problem internally with the arm wiring, it seems that a hum from a broken or bare wire might change it's sound when the arm is moved and changes position. Just a thought.
rwwear
2,692 posts
 
What cartridge are you using? If it happens to be a very high output cartridge like some Grados, they can cause hum.
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