I have been searching for a serviceable replacement AF117 for a failed item in the mixer of one of my "patients". I have several donor boards and have been carefully de-soldering candidates and testing on a peak atlas component analyser.
All I have tried so far (4) show no shorts to screen
but indicate a "Resistor shunt between B-E". None of these candidates help in making the mixer oscillate (but then again, neither does an OC71 in its place).
Has anyone measured a known working AF117 on the peak? If so does it indicate as expected or is this a feature of this transistor on this tester?
I am unclear as to whether all the items I have tested are genuinely faulty or, taking into account the test replacement by an OC71, there is a secondary problem in this area.