Re: CW coil top terminals?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "David Trimmell by way of Terry Fritz <twftesla-at-uswest-dot-net>" <davidt-at-pond-dot-net>

Terry, Toroids would mostly be for "fine tuning", something you probably 
would not need to deal with (high top C has the tenancy to stress the 
secondary). Looking at your photos, I would just replace the Brass bolt 
with the Tungsten point. Sounds like a very interesting project. Looking 
into Dave Sharpe's Staccato design? Jim Lux had a interesting suggestion... 
Perhaps you could also try Amplitude Modulation with a Audio source ;-)

Regards,

David Trimmell
www.ChaoticUniverse-dot-com

At 06:26 PM 1/28/01, you wrote:
>Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>
>
>Hi David,
>
>Would a toroid on top help make longer arcs (in the staccato mode)?  I can
>only tune down to 325kHz so I don't think I can add much top load right
>now.  However, I will eventually wind another secondary probably with tap
>points to adjust the frequency a little.  The RF generator is limited to
>325 to 375 kHz so I have to stay in that band.  If a little toroid would
>help I will account for that.  Having a tungsten point seems like a good
>idea.  I think I can get a ceramic insulator so it can really cook :-))
>
>Cheers,
>
>         Terry
>
>
>At 05:59 PM 1/28/2001 -0800, you wrote:
> >Hi Terry, at least with Tube coils the "hot spot" is really only the
> >discharge spot. I use a sharpened Tungsten rod, so I would go with a small
> >Toroid (Mostly for looks, like one of John's little ones) with that
> >Tungsten needle point. Yes, one could weld with these CW coils ;-)
> >
> >Regards,
> >
> >David Trimmell
> >www.ChaoticUniverse-dot-com
> >
> >At 02:14 PM 1/28/01, you wrote:
> >>Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>
> >>
> >>Hi All,
> >>
> >>I am working on my CW coil and I was wondering what people are using for a
> >>top terminal on CW coils?
> >>
> >>I guess it should be fairly small but I was wondering what would take heat
> >>well.  It is a 900 watt (delivered to the arec) coil and I hope to get it
> >>doing the staccato stuff soon.  Would like a small brass drawer pull be ok
> >>or is the something better?  The coil will melt a pretty good diameter bare
> >>wire.  I may need cooling fins under the terminal since the top of the coil
> >>is PVC or I could add a ceramic standoff insulator if I can find one.  I
> >>could also have a tungsten needle point if that would be best.
> >>
> >>Any thoughts are welcome here.  I hope to soon get this coil running from
> >>an arbitrary waveform generator.  It is 350kHz but the generator can
> >>control the power level and I can play with any power envelope I want then
> >>:-))
> >>
> >>Cheers,
> >>
> >>         Terry
> >