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SUT Hum

I bought a Hashimoto HM3 SUT.
It has a ground connection, but when the ground cable from the turntable is connected to the SUT, there is an audible hum. However, when the ground cable is connected to the ground connection of the preamp, there is no hum.

Is it a common problem? I'm OK as long as the SUT does not generate hums. But I wonder whether it is due to faults in the SUT.
ihcho

Showing 2 responses by atmasphere

atmasphere's avatar
atmasphere
12,138 posts
 
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?
atmasphere's avatar
atmasphere
12,138 posts
 
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?

Yes- that is normal.
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