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Power transformer operated radio vs. a Non power transformer radio
If your radio or TV is AC/DC operated, that means it has no power transformer and potentially may be a shock hazard if certain precautions are not met.
An AC/DC radio has no power transformer, one side of the power line could be at (or near) chassis potential and if any metal part of the radio comes in contact with with you, a shock may result. For more info please read my write up "operating your AC/DC radio". Such radios should have a Polarized line cord to help prevent the shock hazard. DO NOT DEFEAT THIS SAFETY FEATURE.
A radio (or TV) with a power transformer does not have this same shock hazard as the transformer isolates the power line from the chassis.
When servicing AC/DC radios, the use of an isolation transformer is a requirement.
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