transformer hum

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I have a 500VA Avel toroidal transfo- I wanted to know if its normal to hear a slight hum eminating from it. It is loudest when power is first applied to it and then it decreases but doesnt go away. I disconnected everything from the secondaries such as rectifier boards and it made no difference...Is this normal?
 
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Hi Moze,
Most often, that is perfectly normal. If you leave it hooked up and on, let it run for 1/2 an hour (say). See if it gets hot. Since I can't hear the hum, I can't tell if it is abnormally high. Chances are that everything is perfectly fine.

-Chris
 
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