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In Reply to: RE: Need some expert help with coax cable project posted by mr.bear on June 16, 2017 at 14:52:51
The jacket material does impact the overall sound, but not to a large degree.
It is subtle, and somewhat depends on the actual construction of the cable, whether it is coax, twinax, etc.
In my experience, coax is affected more than other geometries, but this is somewhat dependent on the amount of braid shielding. Since you have "taken the cable apart", the braid can "come loose" and will no longer have the stated percentage of shield coverage per the original specs.
Spacing the PET techflex away with some teflon plumbers tape will help ameliorate the effects of the PET, but not totally.
Good luck with your project, and remember to try and physically constrain the cables mechanically against vibration and relative movement between the materials.
Very helpful advice. I was wondering of there were any DIY cable experimenters here after all. I studied teflon tape and acquired the heavyweight "gas service" yellow PTFE tape from a reliable hardware store here in town. It's Mil-spec and quite a bit thicker than the white stuff and has an excellent dielectric constant (around 2 at 1MHz)
The braid on my cables is nicely restrained by an intact length of ordinary PVC(?) jacket at each end, so it can be carefully handled without coming apart.
Your advice about the physical constraint is very good. I am considering using the thinnest (20-mil) "self-sealing" silicone tape to wrap the cable again after wrapping with the teflon.
What's better than PET for an outermost (essentially decorative) jacket? How about glue-lined heat-shrink tubing- probably polyolefin? Provides the physical restraint.
If you must cover it up, then yes, the thin wall polyolefin HS is the way to go.
The adhesive lined HS can be very stiff, if you use the silicone rubber tape, this will provide enough physical damping and constraint, then the thin wall polyolefin HS is just a pretty cover a that point.
The heavy duty PTFE tape will be fine. A layer of "self-sealing" silicone tape over the PTFE layer is a good idea. Don't be concerned about ordinary PET sleeving, since it won't affect performance in a notable way. Techflex Clean Cut sleeving is my preferred option, since it's easy to work with and has the best look and feel, unless you seek a more decorative look.
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