Silver DIY Interconnects

0.64mm is 22 gauge That's too thick for interconnect. Good for speaker cable.

Sean is absolutely right about purity of silver. Since we're not talking about over 100 feet interconnect, there is no real difference between the 99.9% fine silver from jewelry store vs the medical grade 99.999%. I have many different brands of top of line silver cables out there and they claimed that it's 99.999 and 99.99 percent and I don't hear much difference in terms of silver sonic character. The real difference is geometry, thickness, connectors and build quality. Like sean said, play around with different gauge for both ground and signal.

Sean, I would agree with you on the specs for the gauge. I've tried 24 gauge and it sounded muddy in the upper mid range. I tried twisted pair of 30 gauge ( equivalent to 27.01 gauge.) and it works great for me. I'm still experimenting with slightly thicker gauge to see if I get more lower frequency response. I think working from Chris's web site is a start. Finding your own gauge to fit your own system will be base on trail and error experience.

Other than ebay, the cheapest place I found for teflon tubing and cardas RCA connectors is http://www.hndme.com/
You can also buy the "color coded" teflon tubing for smoother sound
They ship the same day.
Use teflon tape from Home depot. You'll need 520" roll per 4 ft of the cable you're making.
I also use the pure silver 99.9% from the jewelry store and it works fine for me.

Audioengr, I would probably agree with you if I'm a cable manufacture who can affort high tech cable making equipment. For DIYs, I don't think there is much difference if one choose to use 3N or 6N. For 30 Ga solid core wire, assume 3N silver cost $0.10 a foot, 4N silver is around $0.80 a foot, and 5N silver is around $1.25 a foot and the 6N silver would cost about $4.00 a foot.
For 40 times the cost for DIY folks, I don't think they can really appreciate the difference of that 0.0998% purity. They might just break the hard to handle 6N cable due to its softness.