I got the pre-amp and now it works great but I"m having trouble when adjusting the rpms.. 33 rpms runs fine but when I adjust it to 45 it won't play. If i move the slider just right before it 'clicks' into '45rpm' it'll run but I can tell that it's slightly off-speed -- any suggestions?? Or am I just going to listen to 33rpms??

Thanks in advance,

Y. Kang