Recently, I have learned something about oscillator, and I also read many articles about it in the Internet.I think I have mastered it, in fact I am totally wrong, and I met many problems.
So here,my problem is :
How to achieve rectangular wave oscillation in the following figure, what are the requirements of the transformer, the requirements of the triode?
If you know the answer, could you please share it to me? Thanks a lot.

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