Shelter 201 hum


I just installed a Shelter 201 on my SME 3012/Garrard 401 combo.  Disappointed there is a far amount of hum present.  I just removed a Shure Type V which had no hum at all so nothing was changed but the cartridge.  I checked all leads and everything looks/feels fine.  Any ideas out there?
wec56
FYI: The Shure has a ground tab on the right channel ( green pin). Sounds like you now have a grounding problem. If you have the tonearm ground lead hooked up , leave it off and see if the hum goes away. If not try to hook it up to another ground source.
Remove the mounting screws and let the cartridge drop down a bit so that its not touching the head shell. Leave the wires attached. Still getting a hum?