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The external phono inputs on hot-chassis Zeniths I have seen connect the shield of the phono jack to the hot chassis with an isolation capacitor for a measure of safety, however I still would be very careful. There can be enough of a voltage difference between a truly grounded device and the phono jack shield to cause a shock if both were touched. Also there seems to be a lot of hum problems when trying to use the phono input with external equipment.
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