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maybe it'll be useful for maintaining the video game with the TV, like you said or the memory for a VCR. generally speaking, typical voltage swings as one would experience in the course of a day aren't going to affect your equipment. take a look at the manuals to see the voltage tolerances for your equipment. now if you've got giant swings in voltage that occur in short periods of time you'll be seeing that in your lights and you ought to be speaking to your power company but i don't think that's what you're dealing with.
as far as even the ones that put out a sine wave, they may well do so, when the power cuts out, but my general understanding is that we're not talking about a great looking sine wave.
as far as surge or spike protection, given that it's typical use is going to be for computers, the power supplies of which are pretty robust, i'd suggest you look elsewhere. usually, we're not talking a lot of joules here and besides, if you're going to protect your HT investment, then everything, and that includes the cable lines, needs to be protected.
I know it looks like it's doing something, but for the money, it really isn't.
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