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148GTL final bias COLD VS WARM

ok update when I spray the diode the mA rise to 100+ witch I would expect when I spray the final they drop to 10mA hmmmm.... is that normal?
I am guessing it is because from what I understand bipolar transistors will conduct more when they get hotter "thermal runaway" and less when colder..?
 
its normal for the idle current to drop if you freeze spray the transistor,
yes bipolar transistors conduct harder the hotter they get, that's what the tracking diode is trying to compensate for & why you see the opposite happen when you spray the diode.
 

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  • @ BJ radionut:
    +1
  • @ heartbreaker3473:
    Hello gentlemen and Ladies. I have the dreaded RCI-2990 receive issue where my radio gets distorted when people get close to my location. I found the C90 Capacitor, but I can not for the life of me find the C89 capacitor. Can or does anyone have a picture of the exact location of C89 ? Thank you in advance, Wes
  • @ AudioShockwav:
    Wes, it's better if you start a thread on the main forum, more people are going to see your question.
  • @ heartbreaker3473:
    Okay, sorry, will put in a forum
  • @ heartbreaker3473:
    I put it in the general disscution help area and started a new thread. Thank you for letting me know.


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