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  1. How to find out if UJT 2N2646 is original or not?

    I bought two UJT (2N2646) before yesterday. I tried to make an oscillator but it was not working. There was a guy from FB who said it could be a duplicate (not original) one. It must be tested. How should I test if it works or not. I googled some and found about diode and resister testing. But...
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