zharca wrote:Hi, the wire you have is probably the best way to make a tonearm cable. It's the way Isokinetik, Incgnito, Michell and many others do it. It's often called "pseudo-balanced".
Keep the shields isolated from the signal wires but connect them to the body of the tonearm and to a separate ground wire which you run to the grounding post of your pre-amp. Don't connect it to the signal wire -ve at any point.
Here's what the cable maker told me about the shield wire: "That's the shield. Its tied to the ground on the RCA side of the cables. It should be tied into the ground on that end as well."
He tied it to the ground on the RCA side. Not what I'd really intended, although I wasn't specific enough I guess.
So, right now, I have the tonearm side of the shield wire unconnected - in fact I cut off the portion protruding from the insulator. Would having that wire connected on the preamp side but NOT connected on the tonearm side cause any issues - like the hum?
NOTE: I did run a separate ground wire from the arm to the phono preamp's ground lug.
I'm wondering if I should bother to open the RCA plugs on the preamp side and disconnect that shield wire. I actually think it's probably not related to the hum. Or hook the shield wire up to the arm on the tonearm side. But the hum is so bad I can't believe the cable being unshielded could be causing it. Especially because I've never gotten hum like this from any other table and I've never used a shielded phono IC before.
I should have just gotten an RCA adapter and used that.