Turntable hum


If I hook up the grounding wire from my turntable to my amp the hum gets noticeably louder. What gives?

Yale
yaluaka
Wow gold star and an apple, Al! When starter caps go bad the motor does make a pretty obvious humming sound, but that only happens on start-up and if bad enough the motor would just make the awful sound without even moving. I've seen this on larger motors and it really is an awful sound!

Older stuff like this they used to let us flip the plugs around eliminating hum. Thanks for the reminder just how far down the nanny state you can't be trusted to tie your own shoes slippery slope we have gone. 

But hey- 1960's turntable, still plenty valuable and useful. Imagine saying that about anything digital. 

Okay. Okay. You can stop laughing now. Seriously. Yes digital is a joke. But come on. Knock it off. Digital, useful, and valuable. All in the same sentence. Dang now I can't stop laughing,...
What preamp or phono amp are you using? Does the hum change as you mov the tone arm across the record?

Thanks so much everyone for your thoughts!  I will check these out tomorrow when I’m at work as I brought this turntable in to work to replace a Thorens 135 that stopped working.  It is going through the phono input of an Ampex integrated amp into powered Genelec speakers.