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Re: Secondary form-black pvc
I have a black secondary form, with a best output over 4 metres!, If you
want to test it, cut a piece off and nuke it in a microwave. If it gets
very warm or
hot it's absorbing rf energy and will not be suitable for TC work.
Tesla list wrote:
> Original poster: Terry Fritz <twftesla-at-uswest-dot-net>
> Hi Alex,
> I really don't know of a way to be absolutely sure. However, If
> two small screws in it about 1.5 inches apart and hook the high voltage
> from say a neon transformer across it for a few minutes and it does not
> burn or get hot, it is probably ok. If it holds static charges easily,
> that is also a good sign.
> At 07:04 PM 9/10/00 -0400, you wrote:
> >Hi Terry
> >Is there a good way to test if the pvc contains carbon? The inside (black
> >part) of the pvc is shiny and I can't get any black stuff off it with paper
> >or my hands.
> >If you want i will post a pic of it on my web sight.
> >Thanks for you input!
> >Alex Madsen
> >----- Original Message -----
> >From: Tesla list <tesla-at-pupman-dot-com>
> >To: <tesla-at-pupman-dot-com>
> >Sent: Sunday, September 10, 2000 5:33 PM
> >Subject: Re: Secondary form, New idea!!
> >> Original poster: Terry Fritz <twftesla-at-uswest-dot-net>
> >> Hi Alex,
> >> Black PVC has a bad reputation especially when it is dull looking and
> >> leaves black marks on your hands (a sure sign of conductive carbon black).
> >> The outdoor and UV protected stuff is full of carbon black. There is a
> >> black kind that is very shinny that seems to like high voltage, but best
> >> not to mess with black PVC unless you are sure.
> >> Sonotube is an old favorite of coilers. You have to make the form a bit
> >> longer to really help avoid surface arcs. The cardboard burns easily.
> >> However, if you make it long, Sonotube is wonderful for big coils and far
> >> less expensive than some alternates. My big coil is made from it:
> >> http://220.127.116.11/TeslaCoils/MyCoils/BigCoil/secondary.jpg
> >> http://18.104.22.168/TeslaCoils/MyCoils/BigCoil/BigCoil.htm
> >> Dry it well with a heat source (like a light bulb inside it for a day or
> >> so) and coat it good with polyurethane. It will be a strong and really
> >> nice secondary.
> >> Cheers,
> >> Terry
> >> At 04:59 PM 9/10/00 -0400, you wrote:
> >> >Secondary form
> >> >
> >> >Hi all
> >> >The 6" pvc I bough for my secondary form I found out was only covered in
> >> >white pvc. The inside ¾ is black PVC. I read here some where that that is
> >> >very bad due to the carbon used to turn it black. Is this true? After
> >> >looking around for a while I fond some 6" cardboard tubing used for
> >> >concrete into for footings and such. It is strong enough to hold its
> >> >and support a significant weight + light weight. I as thinking this would
> >> >perfect for coils. It is less expensive then pvc and come in many
> >> >up to I think 56". The technical name for this is "sonotube" Here is a
> >> >sight run by one of the may manufactures of the stuff. There is a
> >> >description as well as info. on different sizes and pics.
> >> >http://www.sonoco-dot-com/sonotubes.htm There are may there manufacturers. I
> >> >have some form Mercer paper tubing corp. My plan is to cut off the ends
> >> >(which are bent). Dry it well with a heat gun.(to get rid of the absorbed
> >> >H2O which may reduce performance) Give the tube several heave coats of
> >> >polyurethane and then sand it smooth.( there are little bumps where the
> >> >seams in the sonotube are). Then I will begin to wrap the tube with
> >> >Will this work well? Cements please !!!!!!
> >> >Here are some pic of the tube i paln to use.
> >> >http://www.geocities-dot-com/alexmadsen/
> >> >Alex Madsen
> >> >PS I think this would be good for BIG TCs!!
> >> >
> >> >
> >> >
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