Harman-Kardon HK6250

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Hi everyone...
Im new here and this is my first post. Im looking for the Service Manual of my old Harman-Kardon HK6250 amplifier...Something is wrong with him, when I turn it on, there is a noisy sound on the baffles, and dissapear after 20 min working.
... Can someone help me?
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.