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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: The Buzz About PurePowerPosted by drdna on: 7/26/2018
It is always entertaining to see a story about PurePower. I say simply that Richard should make good on the refund as quickly as possible.
I am always surprised to hear about customers who are surprised about this sort of thing happening with audiophile companies. Do they somehow think they are dealing with Best Buy. It is not the case. These are all tiny companies working on a tiny margin and generally barely surviving. How often do we see brands win "Best Class A+ Sound" award of the year, and next year they are out of business? Quite often they take whatever money they earn and it is spent immediately, sometimes before the sale is final. That is a mistake they should avoid, to keep from getting into messes like this when they have to refund someone.
In any regard, the Buzz is a real phenomenon, and Richard's mention of difficulty with solar power suggest to me this may be an issue with coil buzzing. it would be a load-dependent phenomenon, which would be consistent with variable current flow through a ground loop, which would occur with a solar installation. It would also be consistent with the phenomenon occurring only in some systems, which would reflect the variable load-dependent state.
I'm not at all suggesting the input coil topology be changed, as this may actually have something to do with the "magic" sound of the PurePower -- something like the special sound of Fender single-coil pickups on a Stratocaster. However, introducing a artificial variable load to the system may be a way of shifting the coil buzz to an inaudible frequency or significantly dampening it.
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