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WHAT IS THE BEST SINGLE TRANSISTOR TO USE ON A FBT?

what types of good transistors are there that can take more than 36 volts input for driving FBT? I have a toshiba D2586 its good but dont work well above 20 volts I tried doubling my 18v input to 36v and it lasted only a few miliseconds altough it was big sparks, so is this a feedback or over spike return voltages problem  that it cant handle?can anyone tell me why this happens? and what solution there is? ty very much.

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