Replacement Transistor has different pinout: 2SA706 vs BD14016

Discussion in 'Solid State' started by GW Hayduke, Mar 20, 2017.

  1. GW Hayduke

    GW Hayduke AK Subscriber Subscriber

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    Hey guys,

    I'm replacing a 2SA706 with a BD14016 in my Sony TA-1055. I believe the pinout for the is E-B-C, and the BD140 is E-C-B.

    Stupid question, but to install the BD140, do is simply put the BD's base pin in the slot formerly occupied by the Sony's base pin? If so, is it difficult to "bend" the base of the new transistor to fit the center slot in the board, given that the BD's base is on one of the outside legs?

    Clear as mud, right?!?
     
  2. ivandezande

    ivandezande Super Member

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    Yes....I think. You can of course bend the legs to match the pinout, but be careful that they don't touch. You can insulate the legs with very small tubing if you have it.
     
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  3. GW Hayduke

    GW Hayduke AK Subscriber Subscriber

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    Awesome - thanks!
     
  4. dlucy

    dlucy dlucy67 (Doug) Subscriber

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    I had to do exactly that last night:

    Transistor-with-insulated-twisted-legs-IMG_1684.png
     
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  5. GW Hayduke

    GW Hayduke AK Subscriber Subscriber

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    Thanks dlucy. Would you mind telling me what kind of tubing that is?
     
  6. dlucy

    dlucy dlucy67 (Doug) Subscriber

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    It is plain old heat shrink tubing from Harbor Freight.
     
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  7. Ray Gianelli

    Ray Gianelli AK Subscriber Subscriber

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    In a pinch you can also strip some wire and use the scrap insulation.
     
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  8. dlucy

    dlucy dlucy67 (Doug) Subscriber

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    Excellent tip!
     
  9. GW Hayduke

    GW Hayduke AK Subscriber Subscriber

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    Thanks guys!
     
  10. NAD80

    NAD80 Super Member

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    Also if you can get it Teflon tubing works great. The size of the tubing is just bigger than the size of the leads of the transistors. Plus no worry about heat damage like shrink tubing.
     
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  11. dlucy

    dlucy dlucy67 (Doug) Subscriber

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    I had to be extra careful when applying heat to the heat shrink tubing to avoid damaging the semiconductor. Methods like @NAD80 describes that don't risk the device would be better than mine.
     

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