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Thanks all for the response. The transformer was used in a power supply for a battery powered flourescent lantern. There was a large transistor that originally tested good, but subsequently failed- I assume the original problem was that it was weakened. The new transistor output a...

I have come across a small transformer that was surprisingly sensitive to frequency, and there is nothing in my reference books to explain this. It was found in a camping lantern, and was used to step up rectified 12 Volts DC to something like 70 Volts AC for operating flourescent tubes. At...