Both Technics SL1210 mkII's loud hum and almost no sound...

Hi, The weirdest thing ever happened a few weeks ago, I wanted to record a set and I switched on my gear and I experienced a very loud hum coming from both my tt's and there was almost no music seeping through, even weirder was the fact that my mixer (Stanton SMX 501)went schitzo on me, for example:the cue/master fader for the headphones functioned as a panning fader on the channel fader. So I replaced my mixer with a Rane ttm56 and hoped it was the Stanton mixer that caused the hum and weird stuff. The schitzo mixer part is sorted by replacing the mixer. Now I'm left with 2 decks, that simultaneously came up with the same problem, a loud hum and muffled music, also when I move my hand over the turntables the hum gets louder.. I've replaced the rca cable off one deck, not the grounding btw cause that was still ok, and nothing changed.... I'm lost here....