> On 20 Aug 2017, at 23:20, Chuck Guzis via cctalk <cctalk@classiccmp.org> > wrote: > > On 08/20/2017 12:12 PM, Brent Hilpert via cctalk wrote: > >> If the transformer were faulty and heating up internally, it would seem >> unlikely that it would cool off that quickly to recover, IME it takes some >> time for a transformer to cool off. > > I have an open-frame linear PSU that started behaving that way. Turned > out to be a current-sense resistor with a bad internal connection. As > things warmed up, the resistance would rise until the current overload > IC kicked it and shut things down. It was pretty frustrating because > the entire time, the output looked pretty stable.
Dammit. Spoke too soon. The machine ran for over an hour happily Bubble Bobbling so I swapped the disk for Super Sprint and 5V started disappearing on me. I turned it off for a minute and it came back to life and ran for another few minutes steady at 5.4V again. Back to jury-rigging I guess. — Adrian/Witchy Binary Dinosaurs - Celebrating Computing History from 1972 onwards
