FvM said:By the way, 2N222 is PNP (as all germanium transistors), not NPN.
Yes, I forgot about these transistors, used with small transformerless audio output stages. I should correct my statement to as mostI thought the AC127 was the NPN complement to the AC126 PNP?
keith1200rs said:I only remember them because I seemed to forever replacing them in faulty equipment for people!
Keith
FvM said:When replacing a small signal Ge with a Si transistor, you mainly have to care for necessary bias adjustment. Also the e.g. factor 100
higher bandwidth can bring up parasitic oscillations that have been unknown in the original circuit.
Unless intending to exactly restore an antique instrument, I opt for a Si replacement.
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