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Death and Life of a Nait3

Discussion in 'd.i.y.' started by nickcase, Oct 1, 2014.

  1. nickcase

    nickcase Enlightened Member

    Thanks Mark, as you can gather I'm fishing around here.

    Switched one of the R22's already for a wirewound, I'll see if I have any more in stock.
  2. MJS

    MJS Trade: Witch Hat Audio

    I know it doesn't help but I once fixed one of these 3 times in a row because it'd work for me then fry in use. I never got to the bottom of it. Look for damaged tracks if you can, there may be a faulty pad under thermal expansion.
    NAP90's weren't Naim's finest hour TBH.

    P.S The Nait2 used exactly the same circuit but it was very compact. As a result everything heated up at a similar rate and they hardly ever ran away. They were never unstable either. On later 90's they moved the amplified diode bias transistor underneath the board to try and get a semblance of thermal feedback with the chassis heat. That mod has even been carried on into the black series amps.
  3. nickcase

    nickcase Enlightened Member

    But it is consoling!

    This was always going to be a rescue job. The board tracks were shagged. They've been completely rebuilt where the outputs trannies and other emitter driver components have fried themselves in a past life. Naturally that has been quintuple checked but I'll check it all again.

    I may abandon this one soon - lief too short and I've better projects to get finished.
  4. Pete MB&D

    Pete MB&D Pete Maddex, the one and only!

    I would pop a B&O ice power module in, but the chap on eBay that I got mine from doesn't have any for sale.
    Wasn't Les W working on a replacement board?

  5. nickcase

    nickcase Enlightened Member

    A whole world of possibilities open up :) Plenty of class D amps that'll fit in the slimline case.

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