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 
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