DIY Audio Projects Forum

Shielded Pro Instrument Cable
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Author:  gofar99 [ 17 Mar 2013, 21:51 ]
Post subject:  Shielded Pro Instrument Cable

Hi Everyone, I ran into something I did not know today and thought I would pass it along. I was making up a batch of RCA inter connects for general use with bulk instrument cable and discovered that there was a "hidden" layer in them. I always check any cables I make for shorts and continuity after they are fabricated. To my surprise I found that some of them indicated a odd value of resistance between the center conductor and shield. It varied from cable to cable but was generally in the 3-10K ohm range. Close examination of the cable showed that there was a black layer over top of the poly inner insulator. Clearly it was conductive. Scraping the layer away from the ends near the solder joints cured the problem. Live and learn.

Good listening

Author:  Geek [ 17 Mar 2013, 23:11 ]
Post subject:  Re: Shielded Pro Instrument Cable

Awesome advice, Bruce!

I've ran across this using surplus good stuff scooped at flea markets and estate sales. It can drive you nuts figuring out what's up when it's done wrong.


Author:  mwhouston [ 19 Mar 2013, 14:03 ]
Post subject:  Re: Shielded Pro Instrument Cable

I've never seen it. But these days all my cables are from two or three strands of wire-wrap wire so no surprises.

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