Hoping your Xmas, was good to you!!
My Turntable has no "ground connection", I have been playing my LP's loud latley as Mum has been away!!, this is where I notice the low rumble, from my LP,s.
I have bought a lot of Lps from Americia, with are new and sealed!!, A lot of them are warped, However I had a few in the same codition, when using my Old Well Tempered Classic, as it was a long time ago, I dont rember, the low down rumble!!
I have tried all of the above, including the hot temp and humity at this time of year!!
My cartridge is Garrott Bros P77 update "I think this maybe the promblem??"
I look foward to your advice
Happy New Year
If some one