I need help identifying this rusty smd component (sot-23 3 pins). It comes from an early 90's sony discman.
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It’s an PNP “audio” transistor. 20 V and 0.7 A rated.
Given the 0.7 A rating which is a bit more than small signal standard, was it located close to the speaker/headphones output?
X denotes 2SD1048. 7 denotes a hFE between 300 and 600.
You can most probably replace it with any PNP with similar hFE and current capability.