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Trio /kenwood ka2000 bias set up

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  • Trio /kenwood ka2000 bias set up

    Hello people. got a simple one here. Got a 1970s hifi amp in. Came in for sounding bad. All electrolytic caps bad. Replaced them all. Want to set it up circuit has 3 presets.. Can someone help me get it set up
    Circuit to follow
    Arbutt

  • #2
    This is the map. Its the kenwood version
    Attached Files

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    • #3
      Hoping for a little help. This is all working. But I would like to set it up.. 1970s ith never being touched. All new electrolytic caps..
      Any ne willing to help
      Arbutt

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      • #4
        There are 3 adjustments per side. You will need the service manual. If you have it, please attach.
        "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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        • #5
          Here is the adjustment information. If you have not touched the 'protection' trimmers (VR3 & VR4), I would suggest you leave them alone.
          Attached Files
          "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

          Comment


          • #6
            I finally found the manual. I had to join another forum to get it. Part of the set says I need a variac. I don't have one. . Any help is appreciated
            Arbutt
            Attached Files

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            • #7
              You do not require a Variac to set the idle current.
              Honestly, if the unit sounds good and the heatsink does not get overly warm at idle, I would not mess with it.
              Changing capacitors should not affect the output idle current.

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