A good transformer should not hum enough to be annoying.If it does ,then it is of poor quality.That means the iron laminations are too loose and they vibrate in sync. with the current cycles. If your supplier is close,get them to plug in and try them until you get one without the hum.The good ones are usually more costly,but will last longer and do a better job,while being more efficient.
Having made my own xfrmers for special applications,I found this out.
Harold

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