I'm generating a pulse of 3V with frequency 80Hz (12.5ms time period) and

I'm generating a pulse of 3V with frequency 80Hz (12.5ms
time period) and pulse duration 0.125ms and feeding it to
a transformer since i want the pulse to get amplified
around 60V. At the output amplification s happening but the
pulse is changed to a spike, can you tell me what could be
the reason?
(an ordinary transformer 220V-12V stepdown transformer is
reverse connected ie. now it is 12V-220V stepup and voltage
amplification happens)

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