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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 17 Mar 2013, 21:51 
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Joined: 04 Jun 2008, 20:59
Posts: 3646
Location: Arizona, USA
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
Bruce

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PostPosted: 17 Mar 2013, 23:11 
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Joined: 08 Aug 2009, 03:11
Posts: 2208
Location: Chilliwack, BC
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.

Cheers!

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* Ratings are for transistors - tubes have guidelines*
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PostPosted: 19 Mar 2013, 14:03 
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Joined: 06 Jun 2008, 18:23
Posts: 4867
Location: Australia
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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