![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg11kSkb-zSqyl1HV7oP2Mm0QtTo1dx3kQoGfhjfAQdWadgytz0aWA9hFoYcbQ0ry-ePMxGSpTGFCYfihOFUHzjrO_I4kqWD2o1qDVlHf6qHpCTgSTTy5ftH7yeyLZLkJeCVPHtxSh1PNI/s640/transistor+tester+1.jpg)
I have one of these that still works. Mine uses a single 1-1/2 volt cell to light the neon lamp. The trannsistor has to oscillate to drive the transformer and light the bulb. The theory is that sometimes a simple ohm meter test will show a bad transistor to be good.
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