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Transistor equivalent

Discussion in 'Hobby Electronics' started by Glenn, Apr 19, 2008.

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  1. Glenn

    Glenn Guest

    I'm repairing an old Sansui stereo amp. It has a faulty transistor in
    the main power amp section. It's marked A697, a TO92 package (PNP).
    Would the equivalent be a 2SA697?

    Is there a website with transistor equivalents on it for future
    reference?

    Grateful for any help.

    Cheers
    Glenn
     
  2. Phil Allison

    Phil Allison Guest

    "Glenn"

    ** More than just equivalent - it is the same device.

    A BC556 would be a likely equivalent.

    But check the pin connections.



    ...... Phil
     
  3. Glenn

    Glenn Guest

    Wow, thanks for such a quick response. My old transistor equivalent
    book says a BC327A is equivalent to the 2SA697 but it sure doesn't
    behave that way (after correcting for pin difference). Nasty hum on
    that channel now, replacing the severe crackling and popping that the
    faulty transistor produced. Will try your suggested equivalent if I
    can't find an exact match.

    G
     
  4. ian field

    ian field Guest

    My ECA equivalents book suggests BC327A, BC638, BC640 or 2SB647. The limited
    data listed states 65V version of the 2SA696, which is 45V, 0.3A, 0.5W &
    FT=130MHz.
     
  5. ian field

    ian field Guest

    The obvious thing to do is borrow the 2SA697 from the good channel and see
    if that cures the bad channel, and/or try your replacement transistor in the
    good channel and see what effect it has.

    In any case with a stereo amplifier, if you use a substitute part in one
    channel it makes sense to make the other channel exactly the same.
     
  6. Glenn

    Glenn Guest

    Thanks. I found the fault by swapping the transistors between the two
    channels. The BC327 works after all -- I had not looked closely
    enough at the pin order and put it in the wrong way. Once I changed
    this, it fixed the problem. I was thinking of swapping out the other
    channel's transistor too but have left it. The voltage rating on the
    BC327 is slightly lower so didn't want to replace the other channel's
    transistor unless I had too. The amplifier appears to be working
    faultlessly.

    I appreciate all the help.
    Glenn
     
  7. Phil Allison

    Phil Allison Guest

    "Glenn"

    ** Not an AU101 by any chace ?



    .... Phil
     
  8. Glenn

    Glenn Guest

    No, an AU-2900
     
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