Question about SX-650 sub list

Discussion in 'Pioneer Audio' started by quaddriver, Sep 13, 2018 at 11:26 AM.

  1. quaddriver

    quaddriver 120 What's per channel Subscriber

    For the GWH-101 board....

    2SC1438 I have seen threads with KSC1845F or the beefier KSC2383Y. Is there a preference I should follow?

    Also, on the GWR-101 board....2SC1647. I have seen KSC1616 (circa 2015) but lately KSC2383Y. Since I have a drawer of 2383's (O and Y) is that ok?

    Also, since I am in here, its a biotch to get in here, I was leaning heavy to pulling the working A798s for matched sets of KSA992's.....depending on where and when you look for that, sometimes its a 'leave it' item, other people practice shoot on site....

    please advise?
     

     

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  2. zebulon1

    zebulon1 Getting behind on work. I need help? Subscriber

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    Don't use the KSC1616's they are not robust enough.
    2SC1438, If they test okay leave them, otherwise the KSC1845 will work, so will the KSC2383.
     
  3. quaddriver

    quaddriver 120 What's per channel Subscriber

    ok thanks for the info. the machine works just fine, but since I got it used I was doing a recap and looking at problem areas - like the relay pull in, beefier trans in the power supply...1438 is VAS here? since I am in there is an 1845 good insurance or would you not waste the solder?
     
  4. markthefixer

    markthefixer On Hiatus, dealing with Dad's estate full time Subscriber

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    Yes, 2sc1438 at GWH-101 q4 and q5 IS VAS (Voltage Amplifier Stage). I would put in the ksc1845.
    The 2383 would be for current drive which is not needed here and is a slightly lower gain device.

    I have seen instances of apparently working signal amplifing transistors being replaced with new KSC1845's and sound "improvements" being noted - which I note, is a restoration of former performance as opposed to being confused as "better than factory new"...
     
    Last edited: Sep 13, 2018 at 12:28 PM
  5. quaddriver

    quaddriver 120 What's per channel Subscriber

    thanks guys. work resumes after my real job tonight...I wanna wrap this up and get to the 2 sx3700's in the wings!
     
  6. rcs16

    rcs16 Super Member

    Messages:
    3,791
    Location:
    Baldwin, Ontario, Canada
    For a VAS bjt, best choice is one with very low collector base capacitance (Cob) such as ksc3503 and ksc1845, ksc3503 has a higher ft than a ksc1845
     

     

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