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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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http://www.serato.com/downloads/itch

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Hi there on my stanton t-80 decks every so often it will only start playing out of one speaker. I've changed the cables and was fine and then it occured again, its not the mixer because i've done checks on...


It could be a problem with the cartridge/stylus, since you have eliminated the mixer as a source of the problem, it must be in the turntable. The only place for it to come from would be the stylus/cartridge or the wires in the tone arm, or the pre-amp that those wires go to, or some bad solder in the output circuit being used. My guess would be the cartridge and/or stylus, it is taking much more contact and friction than anything else which could cause it to be intermittent. Please understand that I can only guess at your problem since I do not have the unit in front of me to check myself, so I can not be certain of your problem.

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1 Answer

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It could be a couple of different things.

Do you get any sound, even very faint, if volume is turned up all the way?

If so, you probably have the turntable connected to the wrong type of input or you have the wrong type of turntable for the type of input you have on the receiver.

Older turntables have a very, very low level of audio output which requires an input that has much more gain than the normal type of audio input on a receiver.

Many newer turntables and receivers has the same level phono inputs and outputs as the other inputs and outputs of the receiver like the CD or Tape I/O. When an older turntable with such a low level output is connected to this type of phono input the sound is so low you can only hear it very faintly with the volume all the way up.

If you have the proper type of turntable for the type of input on your receiver, then the problem is most likely in the turntable. To check if it is or not, disconnect the turntable from the receiver, and then connect an RCA cable to the receivers phono input with nothing connected to the other end. Then with the volume turned up just about 1/4 to 1/2 the way up, touch the ends of the male ends of the RCA cable that are not connected to anything with your finger lightly tapping it a few times. You should be able to hear the tapping sound real easy in the speakers. If you hear that noise you know that the receiver is OK. If you don't hear anything the receiver has a pre-amp problem or the receiver is not set to the proper function.

If you determain the receiver is working normal, you have a problem in the turntable. Most times it is the stylus or the wires connected to the cartridge which holds the stylus.

Another thing to check is that if your turntable has a ground wire coming off the back of it near the RCA outputs of it, make sure that it is connected to the chassis of the receiver. Most receivers have a ground terminal right on the back that you can loosen with your fingers and then put the ground wire from the turntable in there and tighten it hand tight. If it has no ground terminal on the receiver you can always just loosen a screw on the back and connect it there. Make sure the ground wire has the insulation cut back to expose the bare metal, that insures that you have continuity from the ground of the turntable to the ground of the receiver.

If your turntable has no ground wire, then you have a newer turntable type that would be able to plug into any of the audio inputs on the back of the receiver. It would be a turntable with a boosted signal that can only be connected to an input with the same level as the CD or Tape input.

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If this was helpful for you a "FixYa!" rating would be appropriate and very much appreciated, after all, it is the only reward we get for helping people like yourself for free.

Thanks,

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