Grounding

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Hi All,
I building a stereo using 3 Velleman kits, (phono preamp, preamp, Amp).
My question is what is the proper grounding scheme? my plan was to hook all grounds together, but it looks like that may be a problem. Should I hook all incoming ac grnds together and then all post xformer grnds together at a separate point? This only gets more confusing the farther I investigate.
thanks for your help!
 
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