Hi there, I just bought a DrZ Maz18 NR and with the limited time I had to try it, everything seems fine. The one problem I have now is the bass tone control doesn't have any increased response after 9 o'clock. From 7 to 9 its noticeable change in bass but not after 9. The movement of the pot seems ok. I looked at the bass pot and see the letters B250K and 4F1 on the back of the pot. It has the same feel as the rest of the other pots in that its smooth when turned. Anyone can tell me if its normal for the range to be so limited? Can anyone advice so I can decide if I should send it back? Its a minor issue but I would like something to at least work as it should be when new. Thanks.