SUT Hum

No. I don't think so. I think you just create a ground loop. My tables and preamps work the same way: some on, some off.

Have you tried connecting the ground cable from the table to the SUT, and then from the SUT to the preamp?

The point is to have a hum free SUT. Whether that is accomplished with or without a ground wire, or where that ground wire gets placed, doesn't matter.

What happens when you tie the ground of the SUT to the preamp While the phono ground is also at the same point? Still get the hum?

Thanks for all response.
I connected the ground cable from the turntable to SUT and a wire from the SUT to the phono preamp.
Then, most of the hums were gone. The level of hum was further reduced compared to the ground cable connected to the phono preamp or the preamp.

Is it normal?
Previously I had a cinemag SUT and I only connected the ground cable from the turntable to the SUT, and the hum level was very low.