Lawton Mosfet driving a transformer

Power source to Lawton is from 12 volts of a PC power supply.

Transformer core is from an old TV flyback. Winding is 80 turns bifilar (shown wrapped in blue tape).
Top trace is from mosfet drain. Bottom trace is secondary. Scope time per division is 20 usec. 10 volts per division (10X probes, knobs at 1 volt/div.).
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