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Noise out of speaker from turntable

looking for some leads on potential issue from my turntable

have had this issue for years, in two different homes, have tried cheating the ground pin, different grounding, latest PS Audio HumBuster.

it does seem to be a ground hum, but a low level slightly fluctuating sound, which when platter is spinning, and no music, can be heard. Most of the time, when record is playing, aside from very high volume, the music drowns out the noise.

Years ago, maybe 15 years ago, when I owned a JA Michell Gyrodec, and had a similar noise, he knew exactly what it was, and replaced I capacitor in the motor i believe?

My current table has a separate power supply,it is a Symphonic Line RG-6, the rest is a Graham 2.2 arm, with a VDH Black Beauty Special X, LOMC.

i am now far away from a tech, so would like to diagnose anything here first and hope anyone can offer some advice.

TIA
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justlisten OP
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the system is

Amp-Air Tight ATM3
Preamp-Aloia PST-13

Phono Stage Step up-Conrad Johnson HV1a
Phono Stage-Custom Air Tight with separate tube power supply

Digital-Krell Ref 64 DAC
Krell DT-10 transport
Sony HAP-z1es music server

Speakers-Celestion System 6000
Sub Amp-Sony TA-N77ES
------------------

I typo'd, the sound isn't a hum, it is more of a buzz ,

the arm wand on my Graham was replaced after having a ground lead issue in my prior wand

I just opened up the Turntable Power Supply and didn't see any leaking things on the circuit board.

the TT sits on the top of a Roomtunes rack, on top of a marble slab which the TT comes with, and on top of a large Bright Star Audio sand box
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