Stereo Receiver static when warmed up.

Discussion in 'Community Discussion' started by velocityg4, Sep 20, 2014.

  1. velocityg4 macrumors 68040

    velocityg4

    Joined:
    Dec 19, 2004
    Location:
    Georgia
    #1
    Recently my vintage stereo has developed a new problem. After it has had time to warm up, about 15 to 20 minutes. Static starts coming through the speakers. I'm at a loss as to what it could be.

    Once it starts the static starts to slowly get louder. It doesn't matter if I change inputs or volume (even mute), move the speakers from output 1 to 2, the static volume will not vary at all. It will just continue to slowly get louder. Even if I turn the speakers off I'll get the same static through headphones.

    Occasionally it will also make a popping sound.

    If I smack it the static will go away for a few seconds to minutes.

    Here's what I have done.
    - I've cleaned the pots with Deoxit
    - I visually inspected the capacitors and found no sign of leaking or swelling.
    - Checked and tightened all connections.

    This is a Harmon Kardon HK3500.
     
  2. senseless macrumors 68000

    senseless

    Joined:
    Apr 23, 2008
    Location:
    Pennsylvania, USA
    #2
    Could be a fractured circuit board solder joint that expands and disconnects when the board is warm.
     
  3. velocityg4 thread starter macrumors 68040

    velocityg4

    Joined:
    Dec 19, 2004
    Location:
    Georgia
    #3
    My Yamaha M-80 had that. I suppose I'll have to disassemble it to find out when I have time.
     

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