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being of the "old School" of electronics I see this alot with modern "wave soldered" stuff cold solder joints abound!! in everything from portable radios to cell phones!!!! get a magnified light and look around that connector. A friend of mine had a similar intermitent issue with her Roland G7 X keyboard (same type of power connector). seems that taking the cord in and out agravated some poor solder connections. I sat down with a stong light , a magnifiing glass and the eraser end of a pencil for over an hour and must have foud a dozen poor connections on the power supply board. !! most valve stuff was had built by people not machines so bad connections are rather rare. and usually happent after many years of use!!!! modern fast manufacturing ain't always the best!! slow down and build it right!!!!! Russ
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