For some reason the 555 was notorious for having it’s power supply capacitors going bad and leaking (I had one that did, one that didn’t---or hadn’t yet; both were the Mk.2 version). Was the same true of the 565?
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Your GFA-565 had some bad 220uf caps caused the DC leakage:
http://www.diyaudio.com/forums/solid-state/209059-adcom-gfa-565-a.html |