Hehe 
Back in the vinyl days it was no trouble because (almost) every receiver had a phono preamp built-in. In those days it made sense to keep all of the electronics together, separate from the mechanics. A receiver already has a DC power supply and one or more circuit boards, so you can just make the circuit board a little bigger and add a few components, and you’ve got a preamp. And as a rule, turntable manufacturers were not electronics manufacturers.
But they knew how to make a REAL turntable.
[u]This page[/u] > lists LOTs of turntables with USB & line outputs.
And most of these are junk. Besides, the info on that page is a bit… How shall I put it? Wrong?
Some USB turntables only include a program called Audacity. The manufacturer isn’t doing you any favors. Audacity is difficult to learn and is missing several key features that make vinyl ripping easier, such as CD burning and including looking up album information on the Internet.
Who needs CD burning when every OS on the planet has it built-in since many years?
And looking up vinyl track titles will be a very mixed bag. Who are they fooling?
Besides, most of these included programs suck bigtime, if they even run at all. And which of those do effective de-noising? Not one, I bet.
After looking through that page, I can’t shake the feeling they’re being sponsored by USB TT makers. Ah, yes, they do include sales links to a couple of decent, but overpriced real turntables. Technics SL1200, good table, but waaaaay too expensive. Denon, not bad, also not really affordable, Thorens, also quite overpriced and… Pro-ject. The same TT is available under at least five different brands, all a lot cheaper. How about NAD, Onkyo, AT or Rega? I mean, the Audio Technica AT-LP120-USB has it all, including a decent price tag.