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    PAS2 turntable grounding?

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    Drugolf

    Posts : 25
    Join date : 2014-12-29

    PAS2 turntable grounding?

    Post by Drugolf on Fri Dec 25, 2015 11:30 pm

    How do I ground my turntable with my Pas2 pre since it doesn't have any place identified for it? I tried one of the screws on the I/O board but still got a lot of hum. Hmmm...

    Merry Christmas!

    peterh

    Posts : 680
    Join date : 2012-12-25
    Location : gothenburg, sweden

    Re: PAS2 turntable grounding?

    Post by peterh on Sat Dec 26, 2015 3:30 am

    Ground the chassies in all your things ( at least tie them together, don't forget the record player) and then have at least one of them connected to ground in the outlet.
    The phono cable is sensitive ( more or less depending on brand of cable) for both electric and
    magnetic fields, route it as far from other power cables as possible. Don't collect excess cable in
    a roll.

    GP49

    Posts : 735
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

    Re: PAS2 turntable grounding?

    Post by GP49 on Sat Dec 26, 2015 12:47 pm

    Minor clarification. If any of your gear has a three prong plug, and it is plugged into the AC outlet ground, a separate ground wire to the third outlet pin or the screw in the outlet plate will cause a ground loop. This is more critical in a phono system than in one with only line level sources but is worth remembering.

    Drugolf

    Posts : 25
    Join date : 2014-12-29

    Re: PAS2 turntable grounding?

    Post by Drugolf on Sat Dec 26, 2015 9:51 pm

    This is a mostly vintage system. Pas2 pre, Dynaco ST70 amp wharfedale speakers. none of which have the ground prong of course. They are plugged into an APC surge protection bar. I also have a DAC connected to the aux input that is connected to a computer via USB. Turntable is Technics with the original power cord and RCA cord/jacks. None have the 3rd prong. The only thing that does is the APC power cord. The hum is only when the Pre is set to Phono.

    j beede

    Posts : 328
    Join date : 2011-02-07
    Location : California

    Re: PAS2 turntable grounding?

    Post by j beede on Sat Dec 26, 2015 10:23 pm

    Do you hear hum with phono selected but with the actual phono inputs shorted? Do you happen to be using a Grado pickup?

    anbitet66

    Posts : 132
    Join date : 2009-12-23
    Location : Valley Stream, NY

    Re: PAS2 turntable grounding?

    Post by anbitet66 on Sun Dec 27, 2015 12:31 am

    Drugolf,

    If your Technics turntable has a separate ground wire, attach it to one of the chassis screws on your pas2. If that write is not attached there will be a lot of humming. It is attached to the tone arm separate from the RCA plug ground. Tony

    Drugolf

    Posts : 25
    Join date : 2014-12-29

    Re: PAS2 turntable grounding?

    Post by Drugolf on Sun Dec 27, 2015 2:11 pm

    Yes, the TT has the separate grounding wire. I did attach it to one of the screws on the side (that secures the cover). Also one of the small screws on the I/O board. no improvement.

    How do I short the RCA cables? Touch them together?

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