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Substitute for 2SC458?

Discussion in 'Exclusively Sansui' started by RosserClark, Jan 1, 2010.

  1. RosserClark

    RosserClark Active Member

    Messages:
    204
    In my quest to fix my 2000x, I am replacing the 2SC458s. The 2SC2240 was recommended, and I was going to get them, but Mouser is the only place I could find them, and they won't get any in stock for 6 weeks. They recommended another replacement type, but they were over $2 each, where the 2240s were 17 cents. Is there another replacement for the 458s? Or another place to get the 2240s? Thanks
     
  2. Detailman

    Detailman Addicted to tweaking

    Messages:
    2,138
    Location:
    Daytona Bch. Fl area
    Mouser
    ksc1845 .05 in quantity and a low noise trans.
     
  3. kcollins4

    kcollins4 Rocking somewhere

    Messages:
    5,806
    Location:
    Katy, TX
    I found this quote from a thread by jpdylon, a really good tech.

    "While you're in here, look at the initial audio amp transistor near the input leads of the board. if its a 2sc458 REPLACE IT. These transistors are notorious for becoming noisy and opening. This will cause all sorts of pink noise and crackling. Replace it with a 2sc631 or 2sc2240. I prefer the later for its low noise and low leakage characteristics"


    Hope this helps.

    Not the same gear you're working on, but the thread is here.
     
    Last edited: Jan 1, 2010
  4. ecluser

    ecluser Super Member

    Messages:
    3,219
    Don't worry, virtually every transistors are better than the 2SC458.

    The KSC1845 previously suggested is perfect too.

    I don't know why they called the 2SC458 a low noise transistor since the noise contour map of the 2SC458 shows that it is much noisier than many transistors. For example, the common 2SC945 is much better.
     
  5. RosserClark

    RosserClark Active Member

    Messages:
    204
    Awesome information, thanks. And Happy New Year!
     
  6. tcdriver

    tcdriver AK Subscriber Subscriber

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    Location:
    Valley of Heart's Delight
  7. Frusciante89

    Frusciante89 New Member

    Messages:
    25
    I went to a local Electronic store in order to change my 2sc458 trans... They told me that the 2240 are not longer available and that a good replacement is the japanese 2sc1313... What do you think? Is that a good replacement? What about noise performances?
     
  8. strabo

    strabo Professional Cat Herder Subscriber

    Messages:
    428
    Location:
    Lookout Mountain, TN
    I used KSC1845's in my 2000x with awesome results.
     
  9. Karl vd Berg

    Karl vd Berg Super Member

    Messages:
    1,808
    Location:
    A'dam
    Alex Haidar likes this.
  10. Karl vd Berg

    Karl vd Berg Super Member

    Messages:
    1,808
    Location:
    A'dam
    The 2SC2240, from the link above:

     
  11. larryderouin

    larryderouin Do I get Food, Med's, or more gear this Month? Subscriber

    Messages:
    19,118
    Location:
    Glen Burnie Md.
    In the units where I've replaced the 2sc458's, (2-2000A, 2000X, 3 different AKAI R2R) I took one of the AKAI's and replaced one side with 1845's and one with 2240's. The noise floor on the 2240 is a bit better (I don't have any test gear) than the 1845. Having said that, the 1845 is easier to find and is available most everywhere. The 2240 has been discontinued by the manufacturer, so if you DO find them, stock up. But for general repairs and something that is for background listening the 1845 is fine.

    Larry
     
  12. Alex Haidar

    Alex Haidar New Member

    Messages:
    1
    The best and correct substitute for 2SC458 is BC549 (30V/30V/5V/100mA), a very low noise device.
     

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