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Old 24th May 2020, 9:59 am   #3
paulsherwin's Avatar
Join Date: Jun 2003
Location: Oxford, UK
Posts: 19,712
Default Re: Interesting Diode AA129

The fact that they have a Pro-Electron coding despite the OC71 style glass encapsulation suggests they may have been a way of disposing of old stocks or sweating obsolescent production facilities once the AC/AF series of transistors were introduced.
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