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Home Forums Macintosh 128k 240v Analog Board Component Identification — #2 Macintosh 128k 240v Analog Board Component Identification — #2
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It's a fast SCR ( Silicon controlled rectifier ) E0122 (or E0102YA). It's part of the power supply circuit.

http://pdf.datasheetarchive.com/datasheetsmain/Datasheets-35/DSA-697395.pdf

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