SAN FRANCISCO – Most people gave up on their vinyl music collection two decades ago, when compact discs all but nudged LPs off store shelves for good. If you held onto any favorites, DJ equipment maker Numark Inc. is looking to breathe new life into them with a USB-equipped turntable. It can pipe the tunes of yesteryear into your computer, where you can store them in digital form – or load them onto a media player and take them on the road. The Numark TTX USB ($399) is a sturdy, DJ quality turntable with well-fashioned components and nice styling. Nothing...