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In Reply to: RE: BudP - Ground Loop Tweak posted by pixelphoto on January 05, 2013 at 21:15:03
Don't know why, but the amount of insulation affects the sound.
I have had very good results using small chokes (milli henrys)
The wire I use from my choke to the banana , spade or RCA can make a difference.
I tried it with the whole wire insulated and then no insulation at all and by going to each extreme it was easy for me to hear that the insulation does make a difference, then I tried insulation in different areas.
Because I was using choke and not a loop like the other, it was a little trial and error.
Works GREAT! :O)
Follow Ups:
> > > "Don't know why, but the amount of insulation affects the sound.
I tried it with the whole wire insulated and then no insulation at all and by going to each extreme it was easy for me to hear that the insulation does make a difference...." < < <
You are absolutely correct, benie, - insulation DOES make a difference. As Peter and I discovered during our extensive experiments some 30 years ago and which were referred to by Martin Colloms in his 1984 "Cable Controversy" articles in the British audio magazine "Hi Fi News".
If you want to do something to your wires - after the event of them already having insulation on them so to speak - then put the wires through the freezing/slow defrost procedure.
Put the wire in a plain plastic bag and put it in the domestic deep freezer for one or two nights. When you take it out to defrost, the technique is to allow it to defrost very, very slowly by placing it in such as a towel or a blanket.
Regards,
May Belt,
Manufacturer.
"Put the wire in a plain plastic bag and put it in the domestic deep freezer for one or two nights. When you take it out to defrost, the technique is to allow it to defrost very, very slowly by placing it in such as a towel or a blanket."
Thanks May Belt!
I will try that, unfortunately that will have to wait a while.
My system has been in storage for a while, I hope to have a place to set it back up again very soon. :O( :O)
I will give it a try when I am back up and running.
I put Walker Audio jumper, ribbon cables with no insulation other than a thin raised plastic mesh. Would a bi-wire cable with insulation sound different. My cables are about a foot long. Would longer ones sound better.
My cables sounded excellent at first, but then lost the high frequencies, only to get much better after eight hours. Why is there breakin?
If I remember correctly I did notice a little bit of a swing in performance as well, with it going from good to not so good then back to good again.
I just looked at it as a settling in period.
a
nt
I just did it to components and some it worked on and some it did not (True Balanced). I did not get a chance to try it on speakers as my Acoustat's do not have a traditional binding post as they feed by Acoustat Direct Drive Servo amps. I would like to try it on my Ribbons I have, as our departed member Al always said, " the big ribbons are like an antenna foe RFI."
Because I was using chokes and not the loop a little more trail + error was needed as Bud seemed to have his design of the loop with installation worked out.
My system has been in storage for quite a while now :O(, but hopefully in a few months I'll be able to get things setup again.
I was using Maggie ribbon tweeters as super tweeters and on the amp that was on the Ribbons I had 2 small chokes on it ( 60 mili henrys at 600 ma)
I would like to try some on the binding post of the ribbons as well.
I have a bunch of choke I can use rangeing from 10 mili henrys at 2 amps
to 20 henrys at 500 ma, but I did not have time to try the bigger ones yet.
Stub tuning is common in RF transmission lines and antennas.
Impedance matching and notch filters are common usages.
The length of the stub is usually 1/4 wavelength of the frequency you are trying to match or filter.
Stubs are very popular in microwave devices as the stubs are cheap and very small.
Used this technique for curing RFI on a phono stage. Splayed a group of wires out like an umbrella supprt over the phono section and then grounded it, and basically cured the RFI being induced.
Interestingly , it did not quite have the effect of the Purvine tweak. Naturally the tweak (tuning stub, that is) did lower the noise floor, obviously, but did not add to the sense of dynamics and detail, at least not to the extent that Bud's tweak does.
I have little doubt though, that Bud's tweak may be related to RF design, but I believe it (RFI) may not be the primary causation for the effect. Of course, I may be totally off base here.
YMMV
Stu
a
*
I don't believe in magic either, nor bogus explanations as others sometimes put forth.
That being said, if it were simple RF, wouldn't those Enacom and Walker Filters work better? They use a RC network to roll off the the extreme top end above 100kHz or so, and actually clean up the sound quite nicely. The effect while similar in some respects is different in others, notably the bottom end extension and dynamics.
Enacom makes the filters for RCA ends too and is designed to have your IC plug into the filter. Definitely not the same as the Purvine loops. As a matter of fact I don't particularly like the Enacoms in that application.
of course, YMMV
Stu
PS: BTW, I forgot to thank you for your info on the tuning stubs. Although I have used the technique in the past ( lerned about from an antenna handbook), I had not realized that there was a name for the technique. Thanks again.
a
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