Re: ♩ I'm going slightly mad... ♩ Transistor Craziness!
I suppose this is for the same reason why you have to set a quiescent current to avoid crossover distortion; the transistors do not behave linearly at low collector currents, and hence they give false readings on a simple tester. (Mine says it uses a collector current of 2.5 mA.)
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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