Valves, I am using a clearaudio stradivari. It seemed to track a little better in the V and a have a little more detail in the highs. I also could be imagining it as those differences were subtle. I used several preamps. I had also used several other cartridges with both arms and found less of a difference with for example a denon 103d. Would have happily lived with the IV but having the V decided to keep it.
