Don't plug it in. In a 60 year old thing like that several things would have deteriorated in the circuit. For starters the electrolytic capacitors will be dried out inside and no good by now. Rubber used as wire insulation then is likely falling off the wires too.
These old phonographs were direct wired to the AC mains and the chassis is AC hot if the two prong plug is in wrong so you've got a 50/50 chance of a shocking experience.
Goodwill has one online for $5.95 plus shipping.
You'd think they'd be worth more.
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