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Checking the solder joints and points would be a good first thing to do.
But depending on what the distortion is, it might be this or that. Give me a slightly better description and I will advise you further as appropriate.
Is the Rotel actually used to tune in AM radio ? or to tune in any sort of broadcast or cable signal, for TV or radio ?
Whatever the nature of the distortion, it isn't sourced or caused by an input source of the radio type. So it seem the distortion is *in* the Rotel.
I would say the Rotel needs electronics repair servicing.
(How old is this Rotel device? measured from date of purchase.)