Has it ever behaved and if so, what change happened that initiated the problem?
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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.
I have a Stanton 500, a Shure m97xe, and a Shure v15VMR, and the hum is there on all of them...but it's also there without a headshell attached. I'm afraid it's the wiring in the tonearm as well, but I feel reasonably comfortable attempting to replace it. Is doing that something that will cause me to pull my hair out? It seems straghtforward enough.
They come out of the turntable, which is mounted on the wall, through an opening in the back of the shelf, and connect directly into the preamp, which sits on a shelf underneath, crossing nothing. They haven't been moved in a year or more, but it could've been that I didn't notice the problem when I moved into my current location. But they're not original; they were replace by the former owner with something sturdier and heavier gauge, so maybe the connections are going.
I've may try wrapping the cables in foil temporarily to see if that kills the problem...at least that could narrow it down.
I've done a little searching around and discovered comments here and there regarding the change in capacitance that can occur with heavier RCA cables, which is what the prior owner of my deck put on...I'm not certain what the brand is and I'm not near the deck right now to look, but they're very thick cables with shielded plugs, and the cable itself is probably 75% longer than a standard table cable would be.
I'm starting to wonder if this could be where my problem is coming from, since otherwise it would appear to be in the tonearm wire. I haven't checked the solder connections for the RCAs yet, but I'm wondering if I should just replace the fancy cables with plain old RCAs when I do to see if it makes any difference.
Is there a hard and fast rule about what cables are usable with turntables?
I got into the turntable night before last and discovered that the prior owner's installation of the Ultralink cable had resulted in some circuit board trace destruction. I can't really solder to the next point as they're too close together. It's a stand alone circuit board, meant to be a bridge between the tonearm and RCA cables, and there is a short length of wire between the two.
What would you do? I'm tempted to A) strip the wires going to the tonearm base and solder the RCAs to that or 2) remove that wire altogether and solder directly onto the tonearm base. Would option 2 be the no-brainer?