Another Turntable Hum question

Discussion in 'Yamaha' started by d-ray657, Nov 2, 2017.

  1. d-ray657

    d-ray657 Ain't this boogie a mess Subscriber

    Messages:
    3,677
    Location:
    Overland Park, Kansas
    I just bought a CR-1020. I have cleaned it and applied Deoxit. Tested it downstairs with several different speakers and a few different CD players and Cassette players. Nice quiet and clean sound. I installed it in my main system, and got a low hum from the TT. It is a Sony PS 5 direct drive. It was running fine on a Sansui, I had it grounded, but the issue appears on both the TT1 and TT2. The hum appears whether the TT is on or off, but not if the RCAs are not plugged in. I tried plugging the TT into another outlet, with no luck. All of the other functions are clean - even the Bluetooth adapter (Plugged into the Aux RCA).

    Suggestions? Thanks.
     
  2. slow_jazz

    slow_jazz Lunatic Member

    Messages:
    14,483
    Location:
    SE Michigan, Downriver....
    Frustating ground loop issue.

    Unhook all other rca connections and trial and error.

    Try every ground surface you can think of.
     
  3. 4-2-7

    4-2-7 Smart Ass Sponsor Subscriber

    Messages:
    23,550
    Location:
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    Disconnect the turntable ground wire and move it away from anything else.

    Make sure the tone arm IC are not crossing over other cables touching them

    If you have a sand alone external phono stage do not cross the input outputs IC

    What is this Bluetooth adapter?

    A phono stage and cartridges can be sensitive to RFI from WiFi and BT.
     
  4. Jygesq

    Jygesq Well-Known Member

    Messages:
    609
    you can buy shorting plugs to put into any unused input; I do not have a hum issue, So I do not need them
     
  5. d-ray657

    d-ray657 Ain't this boogie a mess Subscriber

    Messages:
    3,677
    Location:
    Overland Park, Kansas
    Thanks for the response. Here is the BT adapter I am using (no connection).

    https://www.amazon.com/Aluratek-AIS...id=1509985441&sr=8-1&keywords=aluratek+ais01f

    Too much football and too many leaves to do much troubleshooting this past weekend. I will hook up a different turntable tonight.
     
  6. cgutz

    cgutz AK Member

    Messages:
    3,244
    Location:
    SE South Dakota
    I had phono section hum from a Bluetooth adapter too close to my Sony TA4650. Had to move it about 3 feet away. Try unplugging the Bluetooth adapter and see if hum disappears.
     
  7. d-ray657

    d-ray657 Ain't this boogie a mess Subscriber

    Messages:
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    Location:
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    Kind of ironic that those two technologies would clash, isn't it.
     
  8. d-ray657

    d-ray657 Ain't this boogie a mess Subscriber

    Messages:
    3,677
    Location:
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    Removed the BT fob, and made sure that none of the TT wires crossed another. Hum still at full strength. Tomorrow, try another TT.
     
  9. d-ray657

    d-ray657 Ain't this boogie a mess Subscriber

    Messages:
    3,677
    Location:
    Overland Park, Kansas
    Removed the PS-5 and replaced it with a cheapo Technics BD-20, and the hum is gone. I wish I had thought to switch out the Grado cartridge before the switch, since Grados have given me hum issues before. Maybe this weekend I'll try out the AR XB. Long term solution is to get the Sansui 5000X cleaned and the lights replaced to I can get it back in the system. The Yamaha will serve the downstairs after that, now that I know that other turntables will work with it.
     
  10. d-ray657

    d-ray657 Ain't this boogie a mess Subscriber

    Messages:
    3,677
    Location:
    Overland Park, Kansas
    One more update - I now have some confidence that there is nothing wrong with the phono section. I hooked up a slightly better TT - Technics SR-DD22. No noise at all. So it will work with a direct drive and a belt drive - just not the Sony. Now playing a 180G version of Magical Mystery Tour and enjoying it.

    Thanks for all of the suggestions.
     

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