Help! New Nagaoka MP 500 Cart Makes Hum Ground Noise

If you unplug XLRs and keep the table plugged in, what happens to the hum?

Do you have a spare set of RCA cables you can try on digital so that all your connections are RCA?

Is the streamer/dac plugged into to the same outlet as amp, table and sub?

Did you check if outlet is properly grounded?

Was there any hum at all with the Ortofon cartridge?

I have been building my own interconnects for a while now. After completing a PH16 build I started having a hum. My usual interconnect was with Dueland cotton covered OFC into Switchcraft 3502AAU connectors. I ended up switching to Mogami W2549 in a directional format. This has eliminated all of my hum issues from turntable to phono stage to preamp. 

@dman777 Just throwing out a few things -  Does your Luxman have subfilter adjustment for the phonostage section? If  so ,have you either turned it on or off to see if it helps with the hum?  Are you sure that you have the ground cable securely attached on the TT end ?  Maybe double check.  You indicated above that you think there’s an issue with the supplied Tt cables have you tried a different set of phono cables to rules that possibility in/out?

I posted this in your headshell thread....

Not sure what caused it, but on on my SL 1200gr with the MP-500 there was a hum issue with every metal headshell that I tried (including the stock one). I tried a wooden headshell (bought on Amazon) and that solved it. Probably could have been solved with non-metallic screws instead.

I should add that none of my other cartridges have the hum on the same turntable.

Try another pair of ICs to TT. Also double check wiring of cartridge to headshell, especially green and blue. Make sure they’re correct and tight to pins.