I have now tossed all my Amateur switching supplies (almost). The older
they got, the noisier they got.
The last one to go was the Alinco DM-330V. I really liked this as a bench
supply, but its time has come.
It was bad on 160M and even bad on 6M. I replaced it with an old iron
Astron RS70 that I had lying around and that cleared that up. Birdies all
gone.
However, I did get a 30A SolidState Powerwerx from the office to test and I
have to admit is is pretty quiet on HF.
If you really want to be sure, limit you switching supplies and/or have a
good listen to them.
Mike va3mw
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