Turntable hum problem after demagnetizing

thanks for the comments so far. All connections are good. Both channels play. I'll try disconnecting the cartridge tomorrow and see what happens. I did follow instructions exactly as specified. Also, this is a Benz made demagnetizer and I'm using a Benz cartridge - seems strange that they wouldn't be compatible.

One thing I just thought about is if the unit was exposed to a cold temperature, maybe moisture condensation formed inside it, shorted it, and passed enough voltage to the coils to damage them. I don't know its full design, but this sure seems possible with its internal oscillator, in my opinion.

Also, this is a Benz made demagnetizer and I'm using a Benz cartridge ...

They are made to increase cartridge sales :-)

Also, make sure a wire didn't break off inside your interconnects RCA's ends.

Also when I touch the tonearm the hum increases = Ground problem.

There also is static if I clean a record with my carbon fiber brush or touch it to the stylus = You have static build up on your carbon brush. This can eventually happen overtime.

After using it, I now have a huge hum that wasn't there before = possibly indicates a damaged cartridge which is highly unlikely.

Recommendation: Start with a new carbon brush demagnetizer. Disassemble and reassemble all connections, including possibly replacing the ground wire (make sure it didn't get pinched or something). Re-demagnetize with the Benz demagnetizer. If this doesn't work, try relocating your TT to a different AC circuit, along with AMP and speakers....if the hum changes (louder or quieter) you may have a grounding problem not related to your TT. But this is getting to be a longshot and if your house was suddenly having an issue with ground, you would have some other evidence. But I have seen this before so I wouldn't rule it out. If all this is working, borrow a different cartridge and possibly TT if you can and see if that fixes the problem....chasing ground hums beyond a TT and cartride can be very frustrating and usually requires some training and tools.....however, an electrician can determine pretty quickly if you have a ground problem.