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Anyone use an IEC line filter plug??
Anyone use an IEC line filter plug??
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Old 9th February 2016, 04:39 AM   #1
djn is offline djn  United States
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Default Anyone use an IEC line filter plug??

I came across this and wondered if it would do anything to increase the sound quality of the pre-amp I'm building.


https://www.arrow.com/en/products/06...FQUFaQod4zIMvw
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Old 9th February 2016, 05:09 AM   #2
lcsaszar is offline lcsaszar  Hungary
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Yes I use the same in my tube preamp, but I can't comment on the sound quality, since I haven't done an A/B test. I think it does not harm, but does not improve anything either, because RF interference is not an issue at my place.
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Old 9th February 2016, 05:11 AM   #3
ericj is offline ericj  United States
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They are mainly about common-mode rejection. It's basically a P-I filter.

If you have an sq issue that doesn't sound like RFI, it probably won't help.

Well, not more than a boutique power cord anyway
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Old 9th February 2016, 06:49 AM   #4
Wavebourn is offline Wavebourn  United States
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When I do, I open it and cut off Y-caps.
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Old 9th February 2016, 07:45 AM   #5
Shoog is offline Shoog
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If there is a lot of RF interference from external sources such as radio stations, or if you have a lot of cheap Switch Mode Power supplies the power line can be carry ultra high frequency noise into you amp. This might be audible or not depending on the circuit and the build, it will just sound harsh and fatiguing. It will shine a spot light on any shoddy build practices by forcing them into instability and oscillation. These IEC filters are designed to isolate the circuit from the line and prevent these issues.
I use them when I have ones to salvage, but I have never gone to the trouble of actually buying one. They are much more important in digital circuits where the noise will actually introduce gross distortion into the data carrying signals.

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Old 9th February 2016, 09:13 AM   #6
mcandmar is offline mcandmar  Ireland
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Quote:
Originally Posted by Wavebourn View Post
When I do, I open it and cut off Y-caps.
You probably already know this, but most manufacturers make "medical grade" versions which omit the Y-caps.
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Old 9th February 2016, 06:26 PM   #7
Wavebourn is offline Wavebourn  United States
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Quote:
Originally Posted by mcandmar View Post
You probably already know this, but most manufacturers make "medical grade" versions which omit the Y-caps.
Do you mean to buy them? Nope. I mean salvaged from computer power supplies. They are needed for UL certification, if you use SMPS.
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Old 9th February 2016, 08:46 PM   #8
ArtG is offline ArtG  United States
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Quote:
Originally Posted by Wavebourn View Post
When I do, I open it and cut off Y-caps.
When you get them cut open, do you usually find metal film caps or ceramic "Y"caps? Metal film types are more likely to fail open.
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Old 10th February 2016, 06:10 AM   #9
Wavebourn is offline Wavebourn  United States
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Quote:
Originally Posted by ArtG View Post
When you get them cut open, do you usually find metal film caps or ceramic "Y"caps? Metal film types are more likely to fail open.
They are always ceramic. I remove them because they add garbage to the chassis. Such filters are not for protecting the amp from the garbage in the power line. They are for protecting the power line from the garbage caused by a SMPS of the device where they are installed. Try for yourself such a filter in a preamp with unbalanced inputs. Connect a notebook as a source, and listen to the noise generated by a battery charger.
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Old 10th February 2016, 12:01 PM   #10
Refugee1 is offline Refugee1  United Kingdom
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The capacitor across the supply can fail causing smoke and grime inside the equipment. I replace these with a "pulse" type that fails open circuit without producing the mess if you hammer it with 800V P/P pulses. They are rated at 1700V.
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