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Couldn't it be from a tired tube? In a similar vein...I have a 38 year old Sansui receiver (AU-717 solid state) that I still use daily. Never had the cover off. Works and sounds like it did the day I bought it in 1975. Also a Marantz quadraphonic receiver and a Rotel of the same era. Same thing....no hum. How long can I expect these things to keep working without hum?
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Mike
“I wouldn’t want to live under the conditions a person could get used to”. -My paternal grandmother having immigrated to America shortly before WWll.
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