Did you connect the ground wire? If not, it will hum.
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Run a ground wire from the dynavector to the tonearm headshell. Does it go away?
Run a ground wire from the headshell to your main preamp. Does it go away?
If it does go away that will tell you at what point the problem is.
Make sure your rca plugs are clean and make good contacts... Most likely you have a break in your ground wire.
Other possible cause could be the pivot point needle bearing is dirty and breaking the ground, or the contacts to your cart are damaged or dirty.
Try this. There should be a grounding point on the arm itself. See if there's a screw hole on the support for the arm post. Feel with your finger along the right edge. If there is, install a small screw and attach a ground wire which you will then connect to the arm's main grounding point. It's there on my JMW 10.5, but unmentioned in the owner's manual. If it's not there on your JM-9, forget I said anything :-)
Good luck, Dave
Is the cartridge new? Has the hum alway's been there with this cartridge? Have you used the turntable/arm with a different cart. or the cart. with a different turntable?
Can't help wondering if the cart. has an open loop(defective). If so, no amount of grounding will make the hum go away. See if you can try a different cart. or this cart. in a different setup. If it was purchased thru a dealer have them check the cartridge out.
Let us know what happens.
I've been wanting to upgrade the cart anyway, so I will give that a go. I have tried different cables, Monster Cable to inexpensive standard audio cables, no effect. I'm leaning towards the cartridge. I've had the cart on a previous table before I got the Scoutmaster but I did buy it new just as the Shure V15 series ceased production.
Been there done that. Your descripion sounds exactly like mine did. At the base of the turntable tonearm is a phillips screw.Go to Lowes or Home Depot and get a grounding rod and connecter.At home drive the rod in the ground outside as deep as possible near your system or room. Connect a solid wire to the base of your tonearm to the rod outside and anything else you want grounded. Still do the typical grounding to your preamp. This solved my problems with hum.