Steve, I know what you mean. I have an Astron 35M and it plays the same
tune every time I turn it on. I have tried just about everything I can
think of and finally learned to live with the hum. From an electrical
standpoint, the Astron looks really clean on a scope and does a great
job with my Corsair 2. Regulation is great and I can count on 13.8 volts
everytime. My final remedy was to put the supply on the carpet floor
beneath my operating desk. I appears that the carpet absorbs some of
the resonant noise from the case. Let me know if you get any relief!
73
Mike K5UX
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