Rewinding Transformer

Gregory said:

I have rewound a transformer .
The transformer chatters when I apply 240v.AC
At 120v AC It dos not chatter.
The transformer is a Isolation transformer for my CRO.240V to 240V
What causes the chattering and is there a direction the secondary winding has to be placed in relation to the primery winding in reguards to the direction the windings are wound.

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