I made a pair of interconnects last night with Cardas 18ga. magnet wire and Yarbo 50R RCAs.The wire, called single strand Litz(!) from Michael Percy is $23 for 100ft., a screaming bargain when you consider the well-known Vampire is .75/ft.
The Yarbo are from Vt4C, $7/pr. $17 for a 3' pair of IC's, not bad. I put about 2 turns per inch on the wires in the electric drill.
They replace Heartland 89259/Eichmann bullets from CD to pre-amp. The Heartlands are really good sounding but roll off the highs a bit.
My effort sounds clearer on top and just as rich in the middle. Of course, they'll need a million hours to sound their best