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I have a Stanton T.80 and Vestax VMC-185XL mixer. I recently bought Rane Serato Scratch Live which requires the turntables to be grounded through the mixer...however, the turntable doesnt have a ground wire nor can i find an internal grounding switch. The sound through the Serato is humming despite careful and accurate setup...it appears the grounding is the problem...What do I do? Thanks

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  • gium_13 Oct 04, 2008

    hi...thanks...in the end i made my own grounding wire, attaching it to mixer and turntable chassis...it helped a bit but not much...the problem was the level...i switched to line and it fixed it immediately...guess its due to the digital nature of using software on laptop to play rather than just turntable/mixer setup

    cheers


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Hi gium

Sounds like we have reached that point where progressive crossover in technologies means that the usual cautions of earth continuity for the tone arm when using a phono preamp has gone the same way as phono preamps on home theatre.

Have you tried switching to the line level and set the mixer up for that level also. That may reduce any gain induced hum. However it sounds like an earth loop problem, where both decks will need to be earthed in the mixer. Check also that all the gear is running of the same power point. Different mains phases are sometimes available near each other, having any gear (power amps also) on a different phase will cause an earth loop problem.

Is the hum all the time independent of the volume levels, or change with levels adjustments and not at all when turned right down. Let me if changing to line levels helps. We can try some more things, like connecting a temp hookup wire earth to the RCA earth to mixer chassis. Cheers

regards
robotek

Posted on Oct 04, 2008

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