4krow
Seasoned Member
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IMAGINE WHIRLLED PEAS
Posts: 1608
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At this time, I can only address the actual transformer hum itself as it has related to my own experience. Two things come to mind. It is possible that the laminations of the transformer itself are not completely bonded, allowing a physical hum. You could be quite right about potting the transformer to at least acoustically contain the hum, if not hold it tight enough to stop it. Secondly, I was curious as to what actually happens when some transformers are connected to a power regenerator such as a PS Audio P300. The interest here is how changing the frequency of the incoming AC affected the transformer, as if in some cases it sounded 'upset' as though it were struggling, and then smoothed out at another frequency (not always 60hz by the way). In a case such as yours, it does make me wonder about the incoming AC power. I don't think that a power conditioner would make any difference, but like I have said, a power regenerator likely would.
The rest of the hum issues are independent according to your particular wiring, connections, placement, and so forth. Makes me want an entire system built upon batteries regardless of a batteries' shortcomings.
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