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Naim 523 S/K boards - modification ?

Discussion in 'd.i.y.' started by MJSM, Feb 3, 2022.

  1. MJSM

    MJSM Over 60 and barely alive

    Just wondering if it is possible/practical to modify a 523 'S' type board to make a 'K' type to mate up with a Linn Troika cartridge. I would be putting this into an 82 pre-amp.

    I understand that the 'S' variant is designed for general MC types and that the 'K' variant was specifically designed for the Linn Karma/Troika (since they have similar loading requirements ?).

    Obviously the connectors are the same but how much of the circuitry is different, or is it just component values. Can I also ask what the main differences are with the various revisions as I understand they went up to /5.

    I am sure this has been asked previously but a search did not bring anything up.

    Cheers
    Mike
     
  2. DuncanF

    DuncanF pfm Member

    S vs K is just component value changes. You can find quite a bit of info on PFM if you search for the 323 boards. Same as the 523 but the connectors are oriented differently for the earlier pre-amps.
     
  3. a.palfreyman

    a.palfreyman pfm Member

  4. neiljadman

    neiljadman Senior Member

    So on the S variant the input cap/resistor combination is 6n8/470R. Simply change those two to 1n/560R - job done.

    For a significant upgrade use a 0.1% Naked Z-foil resistor. And while you are in there replace the tantalum caps too - same values just a good reliable brand such as Kemet.
     
  5. MJSM

    MJSM Over 60 and barely alive

    Thanks all, as I suspected, it's not much work at all to convert.
     
  6. MJSM

    MJSM Over 60 and barely alive

    Can I assume that the capacitor (6n8) in question is the blue (PP ?) one nearest the 470R resistor at bottom left corner of the board ? and the tantalum caps, are they the larger (marked S.L.C.E) or smaller (red-ended) ones on the board ?

    One last thing, can anyone recommend a decent replacement for the 6n8 capacitor, there is plenty of choice out there but I have no idea what to look for in terms of type, voltage, ESR etc, so a bit of a spec/data sheet would be very welcome - thanks.

    Cheers

    [​IMG]IMG_5301 by Mike, on Flickr
     

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