Brent Jessee (audiotubes.com) and mercedesman on ebay are two trusted and very reliable vendors. Only buy from trusted vendors. Upscale Audio is trustworthy also. Upscale's Ediswans are an amazing tube for the money, with crystal clear highs and nice bass. Or if you don't want to spend a lot, many people rave about the matsu****- Upscale carries these also. Your Lyr shouldn't make noise- it should be dead quiet. Maybe try switching the positions of the tubes and see if this eliminates the noise.
Checkout www.tubeworld.com. Also a great educational resource with lots of pictures...so you can get to know what each looks like.