Help! New Nagaoka MP 500 Cart Makes Hum Ground Noise

@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.

I am at work on my mobile, so just doing it quick reply... The ortofon cart also has a hum but not nearly as bad as the mp 500. I didn’t think to look to notice it until I start investigating with the MP500 ane comparing. So, even though the ortofon isn’t nearly as bad it stinks I do not have a black background. I went the extra mile and even had electrician run two dedicated lines to the circuit breaker about 2 years ago.

I repeat