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2720 Power supply - replaced capacitors, still hums.
http://www.paia.com/talk/viewtopic.php?f=8&t=556
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Author:  toneman [ Thu Jan 09, 2014 7:37 pm ]
Post subject:  Re: 2720 Power supply - replaced capacitors, still hums.

+18V "modulating". Too vague. Modulating at what frequency? 60Hz? Bad filter capacitor, or too much current being drawn or both. Modulating at another frequency (in audio range)? Bad wiring (crosstalk) allowing (an) audio signal to be superimposed on the pwr rail. afn 8-)

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