I once had a similar issue-turned out the motor pully shifted slightly and was too close to the plater and touched it even so slightly, resulting in a sort of rubbing sound, like D, D, D, D...
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It turn out to be the preamp. Somehow wirh DAC powered up, a noise is picked up by the cartridge or phono cable. I tried plugging both sources into different inputs, used a different DAC, to no avail. The noise disappear once I disconnect the DAC from the preamp, or unplug the power from the DAC.
ARC suggests that I try connecting a tape deck to the preamp, and also to swap the tubes in the pre.