In older movers a stunner, but he is not in audiophile good enough ...

So at first I was really excited about this pipsqueak. As I had connected it between my dual turntables and my yamaha rx v673 and everything was perfect. Now new phonograph, this time by pro-ject, a xpression carbon classic. As my problem begins with this preamp. Namely, the new turntable plays much finer and therefore I gather true a slight but disturbing in quieter passages of music humming noise. The cable I've already replaced, because it is not, are finally in my case from Oehlbach (NF 1). But the hum comes not from my turntable, because on my second amplifier, a Technics SL 10 (if I'm there now not mistaken in the model) is the hum is no longer heard, even during idling of the plate, so at the beginning / end which does not come tones. That's why I'm the preamplifier probably unfortunately return and try it with a higher-priced product again. Pro-ject I have not been written off and will therefore not start a trial with the same brand.
The USB recording function works almost perfectly by the way, only the left channel came with me in audacity louder than the right, but not audible, can only be seen as a decisive level!