I bought a Denon DL-110 cartridge around 7 months ago, I set it up on my Goldring GR-1 turntable (a rebranded Rega Planar 1) and after 100 hours or so of break in it sounded excellent. The turntable is connected to an EAR 834 tube Phono preamp "clone". The amp is a Pioneer SC LX-76 A/V receiver from 2012 also sold in the US with the Elite badge. I haven't changed anything or moved anything since I got and set the Denon cartridge but around 10 days ago I started hearing distorsion on the left channel. At first I thought it could be the Phono preamp so I changed its tubes but nothing, distorsion was still there. Next move was to remove the tube Phono preamp and connect the turntable directly to the Receiver's built in Phono in and distorsion was still there but fainter as the EAR 834 "clone" has more gain than the Pioneer receiver Phono in. I have a solid state Goldring Phono preamp around and I checked with it also and distorsion was there too. Distorsion is not constant as it comes and goes and everytime there's a peak of signal distorsions increases. What can be wrong with the Denon cartridge? 'Cause it can't be any other component on my system, can it? I already contacted the on line shop I bought if from, it's a UK shop called Analog Seduction. They've asked me to ship them the cart and they will send it to Denon and get it checked. What can I expect? Does anybody have any reference of this on line shop? What about Denon UK? I have the feeling I'll spend a long time without playing my records... Thanks in advance for your input.