NEC 2SC959 Replacement

Discussion in 'DIY' started by LBPete, Jun 24, 2017.

  1. Alan0354

    Alan0354 Super Member

    Messages:
    2,679
    Location:
    Bay Area
    Don't buy on ebay!!! I even have serious question buying on Amazon from individual sellers. Once I bought an OPA2604 opamp because there was no DIP8 package available from reputable place, but I did buy the SO8 package from Digikey. I compare the waveform and the two looked different. That's why I warmed you in post #10 with bold letters already.
     
  2. stoN_Cold

    stoN_Cold Super Member

    Messages:
    2,670
    Location:
    Belgrade, Serbia

    Maybe it's a generic picture, and I've seen it.
     
  3. jeromach

    jeromach With sufficient thrust, ducks fly just fine

    Messages:
    1,046
    Location:
    O<erveen, the Netherlands
    Wouldn't a KSC2690 just do the job?
     
  4. gslikker

    gslikker Super Member

    Messages:
    1,720
    Location:
    Close to Alkmaar, Netherlands
    Indeed, but if wanting the metal package, the 2n3439 or 2n3440 is the way to go, as they are just aboutthe only higher voltage . If PNP, 2n5415/16 are the complements.
    Now depending on USA guys pay shipping, 2N3440 price at Newark is below a dollar.
     
  5. LBPete

    LBPete Rolling Along Subscriber

    Messages:
    10,935
    Location:
    Long Beach, CA
    The KSC2690 and it's complement would work fine technically but the package is completely different. These are driver transisistors that have a very pretty heat sink on each of them. I'd like to keep the original look.

    - Pete
     
  6. gslikker

    gslikker Super Member

    Messages:
    1,720
    Location:
    Close to Alkmaar, Netherlands
  7. LBPete

    LBPete Rolling Along Subscriber

    Messages:
    10,935
    Location:
    Long Beach, CA
    The original Marantz heat sinks are cooler. Here's a picture lifted from another thread.

    [​IMG]

    - Pete
     
  8. gslikker

    gslikker Super Member

    Messages:
    1,720
    Location:
    Close to Alkmaar, Netherlands
    nice indeed.
     
  9. jeromach

    jeromach With sufficient thrust, ducks fly just fine

    Messages:
    1,046
    Location:
    O<erveen, the Netherlands
  10. gslikker

    gslikker Super Member

    Messages:
    1,720
    Location:
    Close to Alkmaar, Netherlands
  11. jeromach

    jeromach With sufficient thrust, ducks fly just fine

    Messages:
    1,046
    Location:
    O<erveen, the Netherlands
    Well, yes I did, but only these :)

    These are CDIL, which is a reputable Indian brand as far as I know.

    In Holland AST Electronica sells CDIL, but I now notice Electro Andijk does too and even the internationally operating Distrelec. So I guess it must be ok (enough).
     
  12. gslikker

    gslikker Super Member

    Messages:
    1,720
    Location:
    Close to Alkmaar, Netherlands
    Yes CDIL is well-known.
     
  13. Goldie99

    Goldie99 Well-Known Member

    Messages:
    540
    Location:
    The original Boston, UK
    A better European option is probably Langrex in UK - they have the 2N3440 on their current stocklist, and are a reliable supplier of genuine parts, albeit not always the cheapest. You have to call for prices - email response is usually slow.

    https://www.langrex.co.uk/stocklist/
     
  14. petehall347

    petehall347 the brandy coffee man

    Messages:
    23,819
    Location:
    uk.. the middle bit
  15. jeromach

    jeromach With sufficient thrust, ducks fly just fine

    Messages:
    1,046
    Location:
    O<erveen, the Netherlands
    Interesting to see btw what is different left and right, it could be used for a contest :)

    Three resistors and (at least) three transistors I'd guess.
     
  16. LBPete

    LBPete Rolling Along Subscriber

    Messages:
    10,935
    Location:
    Long Beach, CA
    I took this picture from another thread. I believe this is how the unit was found. The thread describes the repair.

    - Pete
     
  17. LBPete

    LBPete Rolling Along Subscriber

    Messages:
    10,935
    Location:
    Long Beach, CA
    I got the replacement transistors and the case has a slightly smaller diameter than the original. Probably the difference between metric and US spec. As a result, those sexy heat sinks don't fit properly. The contact surface is a split circle. I've tried squeezing it smaller but the metal is too springy. I'm tempted to use a dab of high temp silicone sealer to hold it on but I'm concerned there won't be enough heat transfer.

    - Pete
     
  18. Moving Ahead

    Moving Ahead Active Member

    Messages:
    269
    Location:
    Australia
    Originals are TO-5 and the replacement are TO39 -slight diameter difference.
    http://www.datasheetarchive.com/pdf...e0be953189bb7464cc6d00539&type=M&query=2SC959
    The C959 are only .7W pd -your replacement will be much higher so heat transfer won't be critical.
    If you can -apply a heat gun to the heat sink while trying to get it to right size.
    Thermal paste will hold it in place.

    What did you end up buying as replacements?
    Did you notice the hFE classification?
     
  19. petehall347

    petehall347 the brandy coffee man

    Messages:
    23,819
    Location:
    uk.. the middle bit
    2 ways i can think of .1 is make shims and thermal paste . 2.
    is thermal epoxy resin type stuff
     
  20. LBPete

    LBPete Rolling Along Subscriber

    Messages:
    10,935
    Location:
    Long Beach, CA
    I bought the Central Semi 2N3440 and it's complement. I didn't notice the hFE classification. How important is that? I think I can squeeze the heat sinks enough to hold with thermal paste. I wouldn't recommend epoxying them on it would complicate future replacements.

    - Pete
     

Share This Page