Re: RCA Interconnect wiring options question

Posted by Duster (M) on March 16, 2007 at 13:18:15

In Reply to: RCA Interconnect wiring options question posted by Davy on March 16, 2007 at 11:55:55:

The cable you describe is a shielded twisted pair aka "shielded twin core cable" that can be wired for use as a balanced XLR cable, or (in your case) wired as an rca interconnect cable aka "unbalanced single-ended cable". The only thing "balanced" about a single-ended cable such as this is the fact that a dedicated conductor is used for the return path (twisted around the signal path conductor) rather than relying on a shield for the return as in the case of coaxial cables.

When the cable is wired as an rca interconnect cable, the twisted pair is intended to be wired with one conductor for positve (+) aka signal, and the other conductor used for negative (-) aka return or ground. The fact that the + and - are twisted together is an important geometry that's beneficial towards noise rejection (so don't wire both twisted conductors for + and wire the shield's drain wire for - ).

As I recall, the cable you built is intended for a phono-level application. I suggest that you keep the cable wired as-is with the + and - twisted together, then try connecting the mylar/foil shield's drain wire at the phono preamplifier end of the cable rather than at the TT end of the cable (opposite of the diagram). While the TT is considered the source component, the cartridge is a passive device so grounding the shield at the phono preamplifier end is prefered in some cases. Also, you can try the cable wired as-is (with the + and - twisted together) but connect the mylar/foil shield's drain wire at both ends of the cable as another option. One way or the other should solve the problem (I hope)...

http://www.vandenhul.com/artpap/wiring6.htm (Open in New Window)

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Follow Ups Full Thread

Topic - RCA Interconnect wiring options question - Davy 11:55:55 03/16/07 (17)

Re: RCA Interconnect wiring options question - Davy 21:44:21 03/17/07 (0)

I'll try again - jhorowitz128 15:53:08 03/16/07 (0)

I may be mistaken, but.... - jhorowitz128 15:49:01 03/16/07 (5)

Re: I may be mistaken, but.... - Davy 17:01:06 03/16/07 (4)

Re: I may be mistaken, but.... - jhorowitz128 17:31:42 03/16/07 (3)

Re: I may be mistaken, but.... - Davy 18:37:43 03/16/07 (2)

Re: I may be mistaken, but.... - jhorowitz128 20:13:16 03/16/07 (1)

Re: I may be mistaken, but.... - Davy 09:52:40 03/17/07 (0)

Here's something else to try... - SF tech 13:20:43 03/16/07 (6)

That sounds like the Nickleson recipe for toast - jnorv 17:30:08 03/16/07 (1)

That's a good one! - SF tech 17:55:48 03/16/07 (0)

Re: Here's something else to try... - Davy 13:38:49 03/16/07 (3)

Yes, the capacitance and the extra resonance modes of the - Al Sekela 15:08:48 03/16/07 (2)

Hiya Al... - SF tech 17:52:26 03/16/07 (1)

Re: Hiya Al... - Davy 18:40:18 03/16/07 (0)

Re: RCA Interconnect wiring options question - Duster 13:18:15 03/16/07 (0)

I should have mentioned this in my email to you... - SF tech 12:40:23 03/16/07 (0)

Follow Ups

Re: RCA Interconnect wiring options question - Duster 13:18:15 03/16/07 (0)

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