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paulsherwin · 7th Oct 2019, 8:18 pm

If it hums on mains and not on batteries then #2 is almost certainly the explanation.

These radios contain lots of lovely Lockfit transistors which can be responsible for all sorts of strange symptoms. Search the forum for more stuff about Lockfits.

7th Oct 2019, 8:18 pm	#3
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,947	Re: Roberts R606MB If it hums on mains and not on batteries then #2 is almost certainly the explanation. These radios contain lots of lovely Lockfit transistors which can be responsible for all sorts of strange symptoms. Search the forum for more stuff about Lockfits.