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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Hot to neutral cap filter for RFI on AC line posted by cporada@cabnr.unr.edu on March 27, 2007 at 17:51:31:
Surge suppressors work for a while, then the devices used to absorb the surge energy are used up and quit working. Some suppressors have circuitry that is supposed to shut down the output if the devices are used up. If you trust this stuff, then your filters will not be exposed to spikes. However, if you are skeptical of it, you will use only X-rated caps for the added degree of protection they offer.The X rating is for line-to-neutral service, and allows for the cap to fail to an open- or short-circuit. What it is not supposed to do is fail to a leakage situation that causes it to catch fire. There are also Y-rated caps, for line-to-ground service, that are only supposed to fail to an open-circuit condition. Either kind of cap is supposed to be self-healing after minor spikes that would cause other types of caps to develop leaks. If the leak is sufficiently conductive, the cap will get very hot and cause itself or things nearby to catch fire.
Audiophile caps may or may not be self-healing. Since they are not sold for this service, you cannot tell from the markings and it is safer to assume that they are not.
I've found that rated caps that do not attract a magnet give better sound. I've found them in our local surplus parts store by hunting through the bins with a magnet in hand. I don't know if you can specify or order them this way.
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Follow Ups
- I would only use X-rated caps. - Al Sekela 15:09:57 03/28/07 (0)
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