Set the source level so that at ‘full’ or ‘fixed’ volume, you do not get any noticeable distortion from your speaker output… many just set it quite high, between 7 and 10.

Hum might just be a grounding issue - there are several threads on that topic in the community. 

See if these links may help:

Also see this external link:

http://best-turntables.com/how-to-fix-turntable-hu/

There are other possibilities. Setup to play a record, but don’t lower the arm. Move the arm over the playable area. Does the level of hum change with arm position?

I will give that a try tomorrow. The hum comes and goes. Right now I’ve moved the TT away from the amp and speakers. 
 

Thanks for the responses.  I haven’t heard the hum in a few days, after moving the TT away from my Sonos amp.  Don’t really know it that was the issue or not, but I appreciate the help from the discussion group.

Yes this could be an issue because AMP emits an external magnetic field and the turntable’s cartridge is sensitive to magnetic fields. If this is the case for you, it will become obvious as you move the AMP or the turntable arm.