I've enjoyed trying to come up with, in my opinion, good sounding interconnect cables that I can make myself. Last year I bought a second hand Sencore LC102 capacitor-inductor analyzer so I could measure capacitor leakage, ESR and dielectric "memory" as well as inductor values and ringing characteristics. I noticed that the test cable that came with it was labeled RG62A/U with the note to not bend it. I started reading about this coaxial cable, that it was developed as a computer based data transmission cable with a unique structure. It has a center solid conductor with a spiral polymer thread wrapped around it in an open weave. Then there is a plastic "tube" that is placed around the spiral wrapped conductor and then a full braid shield and the final outer covering. The result is an air pocket that envelops the conductor with a plastic sheath and then the shield layer. Since air is regarded as one of the better dielectric materials I wondered how it would sound as an audio cable. The problem was that almost every example used a steel central conductor that was copper plated and I much preferred a solid copper conductor combined with a solid copper shield. After quite a bit of searching I found a supply and began making up some cables. I tried lots of different technics to attach the RCA plug to the cable and still preserve the overall structure of the supporting central strand and shield. I finally worked out a pretty labor intensive method of wrapping a small amount of thin gauge copper wire around the end of the copper center conductor in a tight spiral to keep it perfectly centered in the connection end of the RCA plug. Also I worked out a way to pre-shape the grounding structure of the RCA plug so I could make a good grounding connection, but not deform the important shape of the shield, supporting plastic tube and spiral loop underneath. Different soldering temperatures and lots of RCA plugs later I think I've got a nice method.
The IC seems to measure very well, a 48" IC has around 53pF of capacitance and the DC resistance is under 0.1 Ohm for both the center and shield. The characteristic impedance of the cable is 93 Ohms, so it isn't for digital use.
For analogue audio I really like it. I wanted to have a very revealing quality to the sound but not with any specific "flavor". It seems to treat music kindly, the harmonic structure is easy to hear and doesn't seem "constipated" or "pinched". I only have other home-made cables to compare it to, but I like the nice quiet backgrounds and it seems good to me. I like RCA plugs that have a split center pin for good contact and don't have a thick barrel since I have older gear to connect and spacing is not always very wide.
If anybody wants to try out a pair send me a PM and I'll send a pair, I'd be interested in other people's opinion.