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Most of the AC/DC sets which have exposed chassis or antenna connections have the chassis isolated from the circuit ground with a capacitor to minimize the shock hazard. Most that have the power line right to the chassis have an interlock and an insulated cabinet and knobs so you shouldn't get shocked.
I would replace all capacitors though and check the wiring as the isolation capacitor can short and make the chassis truly "hot".
Although, some of the earlier AC/DC's do have an exposed chassis and powerline right to the chassis. I would not even use these without an isolation transformer.
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