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Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ.

RE: Low Level Hum

In an earlier post you described this effect where, like a switch, the hum appears and disappears by mechanically loading and unloading the stylus by lowering the arm onto the record or lifting it back off. Or at least that was my interpretation of your post.

-Yes, the stylus needs to contact the record and the motor turned on (belt on or off doesn't matter) for the hum to be present.

Is that still happening with this last test you've described?

-Yes.

If it is it is sure starting to sound like an EMI problem to me.

Perhaps some contacts are mechanically shifting, changing impedance by how well they get seated, due to the cart loading effect? or maybe the coil wires internally breaking perfect contact somehow? Has the cart recently been traumatized?

-No, I only moved the turntable from a stand to a wall shelf.

I'm thinking maybe something like this is happening. If the line impedance goes higher than where it is supposed to be there is a chance the naturally induced currents from the motor winding fields suddenly modulating a louder noise voltage at the preamp input due to the higher coil wire impedance.

If you can try another cart you know works to see if it goes away would be a way to test the theory. Sorry if you already ran this test and I didn't notice.

-I do not have another cartridge. I am beginning to think it is a mechanical issue being the wall shelf is on the same wall as the speakers, the hum gets louder as the volume goes up.



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