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main amp

  1. D

    Yamaha CR-600 Problem with Main Amp Test points

    I am retire person who likes to fix things. I am trying to learn how to repair vintage receivers now (if i can find one at a reasonable price.) but that is not why I am creating this thread. I am working on a Yamaha CR-600. I downloaded the service manual. Seems to be a problem with the main...
    • Dennis Ondik
    • Thread
    • cr-600 cr600 main amp test points
    • Replies: 9
    • Forum: Yamaha
  2. M

    Proud New Member

    Thank you for accepting my request to join. I've actually used AK as a great reference guide and it's also a great source of comradery as seen by most of your long standing members. It nice to be included. My personal likes are: Panasonic (Are you still reading... If so thank you. It's...
    • Manaboutahor
    • Thread
    • help love at first ear love you guys main amp main driver board newbie tube amp amplifier wtf
    • Replies: 17
    • Forum: Introductions
  3. M

    CR-800 Main amp problem

    I tested main amp with dummy 4.4ohm load with 1kHz signal and after positive signal clipping few seconds then fuses (F801-804) burned. Then I removed all main amp transistors TR717-720 (4pcs) and measured them, all was ok. Then I tested main amp board without main transistors and output voltages...
    • mikkoa79
    • Thread
    • cr-800 main amp yamaha
    • Replies: 3
    • Forum: Yamaha
  4. N

    Kenwood KA7002 main amp input stage getting hot

    Hello dear Forum members, I am new to this site and also rather new to repairing audio stuff. I've done amplifier 2 re-capping projects succesfully and am trying to save this KA7002. It is a bit of a Family piece, because it belonged to my father in law, and my oldest son wants to use it now in...
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