Music Hall Classic humming issue

I don’t think, see how, it could be 60Hz ground loop hum. The TT motor is powered by a plug in 120Vac two blade step down DC power supply. No equipment ground there.

The power supply’s 120V plug in 2 blades does not appear to be polarized, meaning the unit can be plugged in 180 degrees either way. You might try reversing it both directions.

Note the TT has a ground post lug on the back side of it. Did you run a ground wire from the ground post lug to the ground post lug on the Kanto YU6 speaker?

Are you using a pair of good shielded phono interconnect cables?

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Thanks - yeah, ground wire on both turntable and speakers and I’m using the cables that came with the turntable. I’ll try flipping the power supply plug and see if that helps. 

@fredb72

How close is the TT to the Kanto YU6 speaker with the amplifier?

Your problem could be the TT cartridge and or RCA interconnects is picking up EMI from the 120Vac power cord. Try to increase the distance between the TT and the speaker with the amp. Make sure the RCA interconnects are not close to the AC power cord.

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You should have the Phono/Line switch set to Line.

https://cdn.shopify.com/s/files/1/0710/4649/6578/files/music-hall-classic-turntable-manual.pdf?v=1677776693

7. PHONO/LINE switch
Use this switch to select the audio output type appropriate to your connected audio device, such as a stereo system or
an amplifier. If plugging into a phono input make sure the switch is set to PHONO.

If plugging into a line input make sure the switch is set to LINE.

NOTE:
Be sure to connect the ground terminal firmly to the amplifier or receiver to avoid pops.
If this connection is not made or is loose, a power source "HUM" will result.
You can also use a line input by setting the PHONO/LINE switch at the rear of the turntable to LINE.
*When using the LINE input the ground connection is not required*

Try it without the ground wire connected to the Kanto YU6 speaker amplifier ground post lug.