Turntable with a MACKIE Mixer??? GROUND!?! HELP PLEASE!!

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4-Getta

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Hello,

I got a Mackie Mixer and tryed to connect the turntable of a friend to it. First off, the Mackie doesn't have any phono ins, so I had to buy a phono preamp. Now I got that thing running, but it keep making a sick noise. I've realized that it must have something to do with the ground cable. The problem is, I can connect the ground cable to the Turntable, but my Mackie 1202 doesn't have any ground-cable-support. So I can't connect the GND of the turntable to anything...What shall I do know? How can I fix that problem???
 
you might be able to touch the metal on the ground to the metal on the preamp
 
Tryed that and it didn't work out, guess I got to buy a different preamp....with GND...
 
have you tried grounding the TT to the mixer? any clean metal point on the chassis of the mixer will work as a ground point.

jeff h
 
I'm Back....

Well I did buy a brand new Phono Preamp wich has an extra GND screw.
Guess what?

SAME PROBLEM!!!

I really start freaking out about this ****!
Where the hell is this noise coming from?
Could it be that the TT isn't allright?
That it's broken or something?
Or could it be I'm using the wrong cable from gnd to gnd??
Do I need a special cable??

I'd really apreciate your help...
 
sounds like you have what is known as a "ground loop"

this is when multiple interconnected devices ground themselves to different ground points. the grounded current flows in a loop between the ground points, and both resistance and reactance both play a role in this.

ground everything to a common point. the best material to use is silver or copper grounding braid/straps, not regular wire. if you want to be extreme, you can do what us amateur radio operators do: install a piece of 1/2 inch copper pipe on your bench, ground one end to a real known good ground, and hook up all your equiptment to the pipe with grounding straps and clamps. that's enough to ground tons of reflected RF energy, and should do the trick for a set of turntables :D
 
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Sometimes the tonearms on technics 1200s can also have a hum in the actual tonearm, especially if the connection between the catridge and the tonearm is loose, or between the tonearm and the rest of the table. Do you have just one turntable? or two? if you have two and it's happening in both tables, then no it's probably not a tonearm problem, but if you have only one table and it's old, that could be what it is. I also agree with the other post that there is a high likelihood you havea 60hz cycle issue (I think that's what it's called) which comes from the electrical wiring.
 
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