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| Model: | AC filter according to JR |
| Category: | Power Conditioner/Surge Protector |
| Suggested Retail Price: | 60 $ |
| Description: | Low cost high performance AC conditioner |
| Manufacturer URL: | Not Available |
|
Review by Lukasz Fikus on October 25, 1999 at 13:19:01 IP Address: 195.94.192.78 |
Add Your Review for the AC filter according to JR |
As a follow-up to my previous rewiew I can add the following:The construction has been slightly modified following countless listening tests in some 10 high-end systems.
I decided to reduce the number of turns in each coil.
I increased the wire size. Now I use 2 mm wire with 6 turns per coil (instead of 30 turns).
All copper ends are tinted with solder to avoid contact degradation.The sonic aspect of this filter is un-be-lie-vable ( I am not sure how to spell it correctly by syllable).
In all my high-end "career" nothing amazed me so much. Being a power EE I cant believe what I hear. Technically I filter the high RFI only, but the effect is monumental and 100% positive.Some statistics:
I made 11 units of the filter (4 outlets each). I gave it to try to 10 people. 10 of them bought it. Half of them had other commercial units, and preferred my filter. Nobody had ONE negative comment, while other filters received lots of negative comments. So here we have no trade-offs at all!
Some new owners used terms like "jaw droppind", "impossible" , "like rebuilding my system AND room", etc.It worked with the same result in digital systems (Tact Millenium and Micromega Trio transport with clock link to the amp) and in SET triode systems. Most amazing effect was in a system using Musical Fidelity SS amp.
I made no profit because it is my hobby, but I can imagine this should be a commercial hit worldwide.
Jon Risch - thank you !Lukasz F.
| Product Weakness: | Absolutely none. |
| Product Strengths: | acts as an improvement of every component at the same time. Best value for money ever. |
| Associated Equipment for this Review: | |
| Amplifier: | all |
| Preamplifier (or None if Integrated): | all |
| Sources (CDP/Turntable): | all |
| Speakers: | all |
| Cables/Interconnects: | all |
| Music Used (Genre/Selections): | all |
| Room Comments/Treatments: | all |
| Time Period/Length of Audition: | 6 months |
| Type of Audition/Review: | Product Owner |
Hey,
You guys are making the "non-tech" audiophile green in envy ;^(.
Any ideas how to get one to try. Lukasz, would you care to indulge?
Please,if you have REALLY BAD ac(i.e. harmonics, differential type distortions on line, clipping ac wave- and 90% of us HAVE it) or if you
want to hear real violin sound and not violin modulated by generator in next building,please,don't use ANY filters and isolated transformers.
There is only one way to go-ac regenerators like Accuphase or PS Audio
Power Plants.Don't waist your time and cash.
That's why he has his arse alll over the AC line filtering scheme.Afterall, I don't think he knows what's he dealing with when it comes to 60Hz AC power line.
Just some spam! Ignore it if you guys may.
Jacques
****You live in our own "idealistic " world and we live in a REAL world. Too bad they don't join together somewhere, somehow **********
Ha! In reality i am DBA(data base administrator) of big insuarance firm.
But if you want to hear refrigirator through your system it's your right.
Happy listnening!
What is your problem?This filter has been designed from the ground up specifically for audio use, and has been proven to be as benign as is possible. For most line level components, there is NO downside at all.
For power amps, IF the inductors are used as recommended, then the impact is usually so slight that it defies detection IF there is any negative aspect at all. Most amps do not draw enough current to cause any problems.
If there is ANY RF or EMI on the line, then the filters will provide a distinct benefit sonically. There are very few locations without refrigerators, fans, light dimmers, neighbors with power tools, nearby radio or TV stations, etc., etc. So most people will experinece a significant improvement, rather than any sort of degradation.
Jon Risch
nt
Sounds great, where can I get a copy of the plans? Thanks.
See:
http://members.xoom.com/Jon_Risch/surge.htmYou probably will have to place the schematic into a text editor in order to read it properly.
The use of the recommended parts is a must to meet the design performance, Lukasz used his own ferrite cores, and wound the wire onto them himself. He used either recommended parts OR BETTER to achieve the performance he describes. Even for AC power line use, the parts DO matter, so if you want the results he got, use the right parts!!!!
Jon Risch
do you think 250volt Teflon caps would be overkill?
The caps in mains filters need to be X- or ideally Y-rated types for safety reasons. In adition spikes on the mains may exceed several thousand volts for a few hundred microseconds, so the caps also need to be self-healing to prevent shorting L-N or to earth. You MAY get away with others types, particularly if you use VDRs in front of them, but you'll be taking a chance.Terry
I have never tried using teflon caps in an AC power line filter, but they couldn't hurt. On the othe rthand, it hink I would rather put them in the audio circuit directly, as a bypass for a coupling cap or something.In my note, I recommend metalized mylar, but PP or pS should be just fine too, and at a cost quite abit less than Teflon.
Jon Risch
The best capacitors I have found for this application are the WIMA MP3-X2 series. They are across-the-line rated capacitors with a vacuum epoxy encapsulated paper film dielectric of similar construction to the Rifa (now Evox Rifa) capactors in your construction notes Jon. I have found their sonic properties to be better than any other capacitor in this size range. In addition, the construction is better and the leads are copper as opposed to the Rifa series. The vacuum epoxy impregnation is of course done to remove all air from the windings so they will not support a fire in case of catastophic failure due to voltage transient. A consequence of this construction is that the capacitor becomes a solid block of epoxy because in the smaller sizes (up to about 15MM PCM) the epoxy penetration into the paper dielectric is nearly complete. The sonic rewards of non-moving capacitor plates can be quite astonishing in many applications. I would encourage others to experiment with these amazing capacitors in all applications.Dave
Dave:What is your most reliable source for these across-the-line caps? What values do you use (10mf, by chance?) I am incorporating some of Buddha's noise filtering circuitry into my amp power supplies. I found some caps that will work from Tanner Electronic, but I am always looking for another source.
Thanks--Brad
Go here for the caps Dave named...
BradAcross-the-line type AC rated capacitors typically only range up to about 2.2uF depending on the manufacturer because of the high plate spacing and other safety considerations. I have tried values this high but they do not, in my opinion, sound as good as the smaller sizes. My recommendation was for sizes between 1000pF and 0.1uF which will be between 10mm and 15mm lead spacing. The larger sizes do not have as good epoxy penetration and I find, in direct comparison with the same value made up of smaller sizes, sound a bit 'softer' or more like conventional capacitors (albeit still much better than typical plastic wound capacitors). For larger or smaller capacitors than covered in this range, I have other types I prefer.
WIMA capacitors are widely available from a number of distributors. I use a local distributor in my area.
Dave
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