I've been using the RG-174 coaxial shielded cable that Doug Hoffman sells on his web site. Seems like good quality stuff. The shielding is braided/woven - and I think these things are actually rated for whether the shielding provides 95% coverage or not (or maybe some other %?). Not sure what the intended purpose of this stuff is - audio/video? Computers? Antennas? But I do know it's rated 50 ohms which in the world this comes from is considered low impedance. Now I'm out and don't currently have anything else to order from Hoffman. I cobbled together some bits and pieces to get my current project up and running but very eager to replace the odds and ends with the good stuff. Amazon does not have anything that looks to be the same quality and I can't find a local source. Closest I can find locally: 1) Fry's Electronics says they have it sometimes but not now, try again next week. 2) There is a wire wholesaler where I can get a 1000' foot roll of it. Also - are there particular rules for what needs to be shielded? I know the signal to and from input/output jacks are usually shielded - and of course the ever-reliable "wherever the layout says it's supposed to be shielded." In my current project I have a long-ish run - the "wet" signal from the reverb circuit which runs past a couple of tube sockets and their associated heaters. Not right next to them, but in the neighborhood. On the layout this is shown as regular unshielded wire - but using their chassis and arrangement of components it's a much shorter path and not as much potentially noisy scenery along the way. A nagging voice is telling me to shield this one for sure, maybe others. Finally - asked in another thread - a local amp guru said you should always ground shielded cable at the "destination" end - where the signal travels to. Curious if anyone knows whether this is true and why it matters? Just curious what others have done, what you know works, and what are your "good luck" practices that may or may not help - or any areas where one shouldn't use shielded?