Worn out aluminum electrolytic capacitors usually improve in performance lowering ripple and noise as they warm up.
On Sun, 18 Sep 2016 12:27:38 +0100, you wrote: >Now that's interesting I just re-ran the measurement, and got a quite >different result which is attached. The spurs have GONE. > >My only guess right now is that the E4406A power supply is getting quieter as >it has been on for longer (I've only had it powered for short periods before >now). > >Dave _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.