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Thread: 2sc2259 replacement

  1. #1
    Master Destroyer nosaj's Avatar
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    2sc2259 replacement

    Hello I have a kenwood super 11 reciever thatI have a 2sc2259 Q7 that is bad.

    Juan helped me build a VCA before for a rare chip type.

    If I wanted to take 2 regular NPN transistors sharing the emitters to fill the 5 holes which common audio transistors would you choose?
    Granted this is just so I can suss out the rest of the power amp for now.

    Thanks,
    nosaj

    2sc2259 specs https://alltransistors.com/crsearch....e=250&caps=SP0

    2sc2259 datasheethttp://www.datasheetbank.com/2SC2259...PDF-Mitsubishi

    Kenwood super 11 service manualhttps://www.vintageshifi.com/reperto...ice-Manual.pdf

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  2. #2
    "Thermionic Apocalypse" -JT nickb's Avatar
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    2 x KSC1845 but you'll have to jiggle the leads a little.

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    Master Destroyer nosaj's Avatar
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    Quote Originally Posted by nickb View Post
    2 x KSC1845 but you'll have to jiggle the leads a little.
    Given that what do you thing about a 2n3904 which I do have on hand, specs seem comparable to KSC1845.

    Thanks,
    nosaj

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    Master Destroyer nosaj's Avatar
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    Quote Originally Posted by nosaj View Post
    Given that what do you thing about a 2n3904 which I do have on hand, specs seem comparable to KSC1845.

    Thanks,
    nosaj
    Looking that over that's gonna be some tricky legwork. 3904 EBC 2259 BCECB

    I'm not sure I can finagle that. Only half of the 2259 is dead the left half. I'm thinking about just cutting pins 1 and 2 which I'm hoping will release it from protection and inject signal at pin2 .

    Thanks Nickb,
    nosaj

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  5. #5
    Master Destroyer nosaj's Avatar
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    Quote Originally Posted by nosaj View Post
    Looking that over that's gonna be some tricky legwork. 3904 EBC 2259 BCECB

    I'm not sure I can finagle that. Only half of the 2259 is dead the left half. I'm thinking about just cutting pins 1 and 2 which I'm hoping will release it from protection and inject signal at pin2 .

    Thanks Nickb,
    nosaj
    Snipped leg 2 injected signal at pin2 audio on the left channel transistors. Just need to verify at the speaker jack to make sure it's out of protection mode.

    nosaj

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    "Thermionic Apocalypse" -JT nickb's Avatar
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    Quote Originally Posted by nosaj View Post
    Looking that over that's gonna be some tricky legwork. 3904 EBC 2259 BCECB

    I'm not sure I can finagle that. Only half of the 2259 is dead the left half. I'm thinking about just cutting pins 1 and 2 which I'm hoping will release it from protection and inject signal at pin2 .

    Thanks Nickb,
    nosaj
    The 2N3904 is only 40V whereas the original was 100V.

    The two transistors in the one package have important properties of electrical and thermal matching. Therefore you should replace using matched transistors whose cases are bonded together. Using different transistors is probably not a great solution. I'm sure there are other transistor available with a simple lead out but you still need to couple them together.


    The KSC1845 (and KSA992) is something I have a pile of on the shelf that gets substituted for the differential pair in all kinds of SS amps,

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  7. #7
    Master Destroyer nosaj's Avatar
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    Quote Originally Posted by nickb View Post
    The 2N3904 is only 40V whereas the original was 100V.

    The two transistors in the one package have important properties of electrical and thermal matching. Therefore you should replace using matched transistors whose cases are bonded together. Using different transistors is probably not a great solution. I'm sure there are other transistor available with a simple lead out but you still need to couple them together.


    The KSC1845 (and KSA992) is something I have a pile of on the shelf that gets substituted for the differential pair in all kinds of SS amps,
    I found some originals to replace them with. I was just looking for a solution to finish running through the rest of the signal path. It's still sitting in protection mode but signal is getting to the output transistors now.

    nosaj

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