I made some from the "patio- cord" extension cords sold at big box retailer's.
It sounds fine, I wasn't sure at first but either it broke-in over time or my ears adjusted- I'm never really sure which. I'd do a double-blind test, but I live alone and I can be very convincing and quite gullible. Oh, and I've read recently that all copper made these days is oxygen free. I don't believe everything I read, nor do I believe everything I think.Try it- If you're a tinkerer you'll swap it out eventually any way. I've spent more and gotten less. Of that, I AM certain!