It’s called rumble, two fold. The weight is to great on the head shell or something need service. Rumble is the floor noise of a given TT, it can be reduced a lot or increased because of maintenance.
BTW ALL the older Preamps had filters, the better the preamp the better the filters.. Rumble and Tape filters, were a just of a few.. The reason I like Mac.. They had the BEST filters and lowest floor noise, when NOT using them. Fisher was close too..
Oh one other thing.. I could be wrong.. :-) Get some springs under your TT.
TT 101, get springs, get deadening matt, get HEAVY. I use Russco broadcast TT. They have a TINY bit of rumble.. I keep a cool 1/2 dozen TT here for builds.. Garrard Killers... Russco, QRK, Sparta..
Close to my Thorens.. Better than Garrard though, hands down.