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It sounds like it wasn't "fully restored". At the very least it's going to need the power supply recapped from your description of the hum. I wouldn't run it any more until you get at least that much done.
You should get a service manual, either downloaded from a lot of sites or someone here who has one.
You should post the model number and/or the chassis number.
There are lots of friendly people here who will help all they can.
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" I'm gonna fix that one of these days"
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