• Re: PAS hum (full Curcio mod PAS) - Joe Curcio 07:35:57 05/26/03 (1)
  In Reply to: PAS hum (full Curcio mod PAS) posted by airtime on May 24, 2003 at 17:22:33:

  You have a ground loop - you can't assume all gorund connections are the same. _All_ the power ground connections from the audio boards should go to the power supply module (terminal numbers should match terminal numbers per the wiring diagram). The I/O ground connections (inputs & outputs and volume control) should terminate to (and only to) the line amp module.

  The connection from the power module to the chassis ground should be via the single ground lead terminating at the quad cap.
  
  

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  • Thanks will give it a check later - airtime 09:42:53 05/26/03 (0)
    In Reply to: Re: PAS hum (full Curcio mod PAS) posted by Joe Curcio on May 26, 2003 at 07:35:57:

    Thanks again Joe.
    charles
    PS finally learning how to use that scope. I even fixed a few stereos last week for some guy I know out west who resells them on ebay. I'm slowly inheriting my father in laws old electronic stuff. Got a AF/RF Lafayette sine generator. Sure the AF in only 400hz but I'm a newbie.
    
    

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• additional info - airtime 17:47:20 05/24/03 (0)
  In Reply to: PAS hum (full Curcio mod PAS) posted by airtime on May 24, 2003 at 17:22:33:

  I placed a jumper from the volume pot ground to and additional ground and it decreased the hum by about 80%

  charles
  
  

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