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I had occasion to strip my system power center down for upgrades, so had the chance to investigate the noise with the Sony TV. It's not audible for me with the power center. First, it is definitely the TV, doesn't matter if it's on or off, noise is the same as long as it's plugged in. Even worse, the Sony TV picks up all the crap from lights on dimmers etc. ...nothing else in my system does, noise is only when the Sony is plugged in.BTW I normally have no connections from the TV to my audio system at all, had no other connections to the TV for the test, so the TV noise must be via the TV power cord.
An AC isolation transformer for the TV is the solution. Totally kills all noise, dead silent, turned on every dimmer light I had as a test and still no noise, either high frequency or hum. It's not the filter as I had thought before, the filter doesn't matter it seems, it was actually the isolation trannie that was killing the TV noise for me. Who knows what other benefit I'm getting, hell the picture might even be cleaner because of the iso trannie.
Follow Ups:
Any specifics of type or rating for the AC isolator?
The one my TV is on is a Hammond 169G, about $80 and good for 500W. I wired it up myself, it also has several taps for adjusting the line voltage if you want. A more convenient one for you may be their 171 series, as these come with 3 prong outlet and cord pre-attached, about $105 for a 500W one. Since it is pre-made, you might be able to return it if you aren't satisfied, as compared to one you have to solder up to try. If you have not tried putting some of your audio gear on iso or balanced power trannies, you are in for a surprise, so I doubt you'll not want to keep it, especially great with digital components. Anyway, if you get one, make sure its VA rating is higher than your TV power consumption. My RPTV is said to require up to 230W (VA), but a 500VA iso trannie is only a few $$ more than a 300VA one, and not much larger in size.[Before, when I said that the filter doesn't help in the noise reduction, it probably actually is doing something. I just couldn't obviously hear it in my quick tests. The iso trannie removed all audible electrical noise i.e. none audible in audio system with volume at max. The filter would have a more subtle effect at much higher frequencies of noise.]
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... Paul
I don't have a good inexpensive source in the U.S. You could try Newark and Allied, they have them, but IMO pricey. Digi-Key might too, they carry some Hammond trannies. I buy from Electro Sonic in Canada (e-sonic.com) and they are considerably cheaper, as well as they carry the full Hammond line. They ship to U.S.For DIY there are many other brands, Signal being a good one that comes to mind, order from the factory.
If buying pre-assembled with cord and outlet, best if it has 3 prong hardware, as many are 2 prong only. For TV you only need 2 prong, but 3 prong is more versatile for experimentation with other gear. Plus the 3 prong stuff usually has an electrostatic shield between primary and secondary, and you need a ground prong for that to work.
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