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Newbie Crown user....CL1 power amp transformer hum audible. Normal?

Hi, I just received a used CL1 power amp and upon turning it on, there is a noticeably audible 60Hz hum from the power supply transformer. And one can feel a vibration on the steel chassis at 60Hz. The amp is at idle and the fan is not rotating.
Removing the service panel shows no damage or loose components. the transformer is secured.
Is this normal for a pro amp, this model? Seems odd to me for an audio amp to be making noise like an old truck battery charger!

Thanks in advance.

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