Re: RE: [TCML] Toroid Problems

["Neal Namowicz" <neal@xxxxxxxxxxxxxxxx>]

> Nicholas -
>
>  You stated that your toroid was made from "dryer duct" material. Can you 
> confirm that this is really convoluted aluminum HVAC ducting (formed from 
> heavy gage aluminum foil, like disposible pie-pans are made from), and not 
> the thin aluminized polyester material wound around a coiled spring core? 
> You need to use the HVAC duct material, which comes compressed but is 
> stiff enough to hold out at 90 degrees without sagging. The usual "dryer 
> duct" material is metallized plastic film over a wire core (like a 
> "slinky" toy), and is NOT conductive.  I have seen several first-time 
> coilers get confused by the "dryer duct" material, which may look similar 
> to the HVAC duct material if you're looking at a photo on the internet. 
> Quick check: take an open flame and apply it to the material. The 
> aluminized polyester material will instantly melt,laving only the inner 
> spring,  but the flame will have no effect on the aluminum HVAC duct.

I've been following this, and I have just a brief note re: the use of drier 
duct- It's been a while since I put my topload together, so I don't recall 
for sure which type of material I used. However, I did cover the entire 
thing with aluminum foil tape, and I get pretty decent sparks off of it. I 
just thought it might be a way to recover the topload without having to 
start all over.

Neal. 

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