The capacitance of a cable is determined by its geometry and its materials, particularly the dielectric. PTFE is good, foamed PTFE is better, and air is the best dielectric.
The lowest possible capacitance would be two widely spaced, bare wires in parallel, with no shielding, and no dielectric (ie an air gap). This would clearly not be practical.
The lowest capacitance practical interconnect that I have come across is the Chris Venhaus DIY here:
http://www.venhaus1.com/diysilverinterconnects.html
It works really well for line level interconnects, but is insufficiently sheilded for use as a tonearm interconnect.
For your purposes I would expect it to work very very well, and outperform commercial cables up to several hundred dollars. To reduce the cost you can substitute the silver wire with enamelled magnet wire from Radio Shack.
The lowest possible capacitance would be two widely spaced, bare wires in parallel, with no shielding, and no dielectric (ie an air gap). This would clearly not be practical.
The lowest capacitance practical interconnect that I have come across is the Chris Venhaus DIY here:
http://www.venhaus1.com/diysilverinterconnects.html
It works really well for line level interconnects, but is insufficiently sheilded for use as a tonearm interconnect.
For your purposes I would expect it to work very very well, and outperform commercial cables up to several hundred dollars. To reduce the cost you can substitute the silver wire with enamelled magnet wire from Radio Shack.