About NAIM NAP 140 building

Discussion in 'DIY Discussion' started by bermek, Feb 24, 2020.

  1. bermek

    bermek

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    Hi people,
    I wanted to mention about a problem in my project with building a NAP140 amp clone.
    After putting everything together, I realized that although the sound is clean and satisfactory, one of the transistors (ztx653) and the resistor on its leg (I believe it was 2K2) on both channel boards are heating up seriously. I came to the point that I had to turn it of so it doesnt burn.
    Anyone can offer a solution to this problem, or ways to troubleshoot, and/or experienced a similar problem?
    Thanks in advance.
    Hakan
     
    bermek, Feb 24, 2020
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  2. bermek

    Gerontius

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    Hi Hakan,

    Have you got a suitable heatsink on the transistors? I seem to remember that Naim mount the power transistors on the chassis to keep them cool. As for the 2K2 resistors, you could try using ones with higher power dissipation.
     
    Gerontius, Apr 2, 2020 at 6:06 PM
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