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In Reply to: RE: Is balanced power not worth the effort compared to filtered power ? posted by Carl G on February 10, 2009 at 19:21:16
Following advice from another inmate, I experimented with the metallized paper (MP3) suppression caps from Wima. These are rated for line use, but are a little harder to find: the Mouser catalog listing for them mistakenly identifies them as Polypropylene. Farnell (UK) also carries them. They are far superior in sonic performance to the polypropylene and polyester types. Ceramic suppression caps for smaller sizes have unacceptable sonic properties.
Your source does not distinguish among the available types of suppression caps, so the conclusion, that these give similar results to balanced power, suggests there are limits to how well any of the source's implementations work. The advice is worth little, IMO.
Follow Ups:
My conclusion stands regardless of the choice of rfi supression cap construction. I, and others prefer, a CMC based conditioner implemented to also provide substantial differential inductance to a topology using low cost transformers back-to-back. The Felicia was simply a minor extension to Jon Rish's SQ&D Iso Trans using 2 surplus, no longer available, $10 Signal A41-175-28 transformers, wired to provide isolation, filtering and technical (balanced) power. My comment referenced the Felicia project, not balanced conditioners in general, especially those using bi-filar secondaries or other precision balanced windings, and with mininal capacitive leakage between primaries and secondaries, either with multiple bobbins and/or shielding between primary and secondary.
As to what is the 'bestest' it depends on the implementation. If you want isolation between components, you need series inductive elements between components anyway. A single balancing transformer cannot provide this.
I've been using Wima metalized paper suppression caps, as well as the Evox/Rifa PME versions ever since late '99 when Dave Ingels and Jon Risch discussed their respective favorites. I also use metalized polypropolene suppression caps with them. I try not to be as doctrinaire as others, using what measures best objectivly, tempered with subjective ascessments. I saw (and still see) absolutely no need to wax priaprismic over supression caps in making a recommendation between a diy Felix or Felicia. I've heard and evaluated them both using all metalized paper caps, all metalized polypropes, as well as integrated versions.
FWIW over on ebay sarahp2768 in Tuscon, Arizona has Signal A41-175-28 trafos for $5. Last time I checked with her she had quite a few of them.
-- Chris
The OP quoted you thusly:
"The 'Felix' conditioner, based upon reasonable cost, easily available common mode chokes and X capacitors provides similar results and is easily implemented -"
Since I have a lot of experience with different types of suppression capacitors (both X and Y), in audio equipment and non-audio appliance AC noise filters, and I've heard consistent significant differences between the paper and synthetic film types in both applications, I have to assume you either do not hear such differences or don't care to divulge the information to the DIY community.
If the latter (which is fine with me, by the way), then the OP is wrong in drawing conclusions about your preferences. In either case he is wasting his time without further guidance.
Do you mind sharing some of your findings regarding the differences among caps(X and Y).....for audio vs. video?
Mitch
My TV-watching is limited and I'm too cheap to pay for HDTV.
My view of cap performance is that they do their primary job of providing low impedance over a defined frequency range, but add the parasitic behaviors outside that range. I'm not sure the audio-band behaviors of film versus paper caps are important for video.
Is there one brand/flavor in particular you prefer overall?
Mitch
The MP3 is the metallized paper version. Wima also makes synthetic plastic film versions (polypropylene, not sure if they make polyester as well). Look for the MP3 designation. Mouser sells these, but mistakenly calls them polypropylene.
Next Mouser order, I'll replace the panny caps (X,Y) that I have in the JR filter.
The PCB for the JR filter/SS, from DIYCABLE.COM is very sweet. A single and double is offered, AKA Exodus.
Mitch
Depends on the type & how they're used. Try installing a Panasonic Interference cap i.e. a .47uF 250v~x2 (available from D-K) installed accross the primary of the tfmr. and also a snubber following the rectifier diodes (bridge).
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