Zu 103R + Thorens 124 = Hum

I recently purchased a Zu 103R, it is a Denon 103R which is nuded and fit into their own aluminum body, along with other refinements. I installed it on my arm last night and before I dropped the needle to the record on my Thorens 124, I first turned up the volume on the preamp to test for hum, noise, etc... It was quiet as could be at noon on the volume setting and a swipe of the stylus with the brush told me signal was passing just fine.

Once I lowered the cartridge to the record, however, a horrible hum started sounding through the speakers. It wasn't hum akin to a poor ground, there was no static, no buzzing, a definite steady, very low frequency hum. This hum very quickly began to rise in volume (without me touching anything) until I leapt across the room to turn the volume to zero and lift the needle from the disc.

I have read that the iron platters on these tables can have magnetism problems associated with them, yet I also know many people use the DL103 with this model Thorens with no issue. I can't imagine the cause is the aluminum body employed with the Zu design seeing as it is diamagnetic.

Any thoughts? Thank you for any help you can provide.