|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
67.117.67.210
In Reply to: Re: 6as7 life continued... posted by Jack Williams on February 17, 2005 at 16:59:36:
I also forgot to mention that all of the stuff( computers,halogen lights,digital components, etc)that we have plugged in at our houses really pollute our AC lines. I have noticed that even with dedicated lines the pollution still spills over into these lines. Maybe, it's the RF or EMI. I really don't know because I am not an EE. This really is apparent with Halogen and flourensent lights.
Follow Ups:
RF and EMI are issues, but one of the major problems caused by what we call 'electronic loads' (computers, audio equipment, flourescent lights) is distortion of the AC waveform.. When the AC waveform is a perfect sine, all is well, but when it becomes distorted, you not only have additional line noise to squash, but the *power factor* of the line falls off.It's very possible to read "120 volts" at the outlet, but if the power factor is off due to waveform distortion, the actual power that the line can deliver to the load can be considerably lower than expected.
Interesting to see that you feel dedicated lines are not the answer at least to AC noise generated in your own home. I have found with four dedicated 20-amp lines powering my audio system that my system sounds just about the same at any time of day, i.e., darn good. Have you checked to see whether the ground side of your dedicated AC line(s) is/are isolated from "house ground". My dedicated lines are grounded to separate copper poles imbedded in the ground (literally) outside my house, well away from house ground. Perhaps this makes a difference.The various methods for cleaning AC are all meritorious in their own ways, but one must be careful with large tube power amps, which consume power in big gulps, that the device, whatever it is, does not delimit the current available for the amplifier. Brian's problem seems more severe than that which we normally attribute to AC grundge. For one thing, he hasn't said that it's time-of-day dependent. If you get an isolation transformer, make sure it's industrial size. Overkill always makes us audiophools feel good.
Hi Lew,I do believe that dedicated AC lines and grounds are better than undedicated---However, they are not an end all answer to noisy AC. I do have dedicated grounds and I would probaly have more noise than I do now if I had the opposite.I would presume that every house is different in the amount of noise and grundge but I do know that late at night (10 pm to 2am) that my equipment sure sounds allot better--so the only conclusion is that the AC must be influencing my equipment.
This post is made possible by the generous support of people like you and our sponsors: