Re: [TCML] primary material? (interview)

["" <dr.hankenstein@xxxxxxxxxxxxx>]

Have you actually tried comparing the two materials side by side? 


> [Original Message]
> From: DC Cox <resonance@xxxxxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Date: 7/18/2008 2:34:41 PM
> Subject: Re: [TCML] primary material? (interview)
>
> Bart & Gary are correct --- alum is not the best choice.  Alum can be used
> for high voltage transmission lines cross country because it's resistance
is
> reasonable low at the 60 Hz frequency, but at RF frequencies that Tesla
> coils operate at, it's a very poor choice.  In the primary it will cause
> excessive resistance at operating frequency frequencies which reduces the
> overall peak currents.  Remember high peak currents in the primary (which
is
> why we used pulse caps -- to get a high peak current) produce powerful
> magnetic fields which encompass the secondary coil.  When this magnetic
> field collapses rapidly, a high voltage pulse is produced in the sec coil.
> With a weaker pri current, the sec coil will not receive as much energy
thus
> producing a weaker spark --- certainly not as bright as copper.
>
> Happy sparkin' with copper,
>
> Dr. Resonance
>
> On Fri, Jul 18, 2008 at 12:11 PM, John Matok <jmatoknoon@xxxxxxxxx> wrote:
>
> > What affect would aluminum have on my performance?  If it's cheaper, why
> > wouldn't everyone use it?
> >
> > Nicholas
> >
> > On 7/17/08, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
> > >
> > > Hi Nicholas,
> > >
> > > Yes, all metals are up in price everywhere. It makes choices more
> > > difficult. Copper is up about 50 cents/lb as well as aluminum. The
> > > difference is $4/lb with copper versus say $1.50/lb with aluminum
(just
> > > looking at scrap rates). Anyway, you could build the primary with
> > aluminum
> > > tubing. It's sold in the hardware stores also and is certainly an
> > > alternative.
> > >
> > > Take care,
> > > Bart
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