Grandpad, for reasons completely unexplicable I've found single ended interconnects from preamp to amp make excellent antennas. I had an annoying low level hum I just could not get rid of, switched to balanced cable, sweet silence! What a revelation. If you don't have balanced outputs on your preamp or balanced inputs on your amp you can always use Balanced-Single ended connectors sold by PAD or BAT.
Goone...VK30's do come up on the used market. I bought mine right here on the 'Gon. Jeff