Re: winding the secondary

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Hollmike-at-aol-dot-com>

I think mostly you want to remove the printing from the pvc.  It could be 
slightly conductive, if black anyway.   I never worried too much about drying 
it either.  Then again I live in Colorado which is a fairly dry area.  I only 
coated mine prior to winding with one coat of Krylon(now Sprayon) insulating 
varnish.  After winding, I only gave it about three coats of the same.  Never 
had any troubles with racing sparks, shorts, or anything.   I have seen coils 
with thick coatings that wind up 'crazing' due to changes in temperature, so 
I personally will avoid such. 
Mike 


>
> Hi list, 
> I am getting ready to wind my secondary and I have been reading different 
> approaches.  Brent Turner's book says if you use a plastic (PVC) pipe, just 
> sand it and clean it, wind it and seal it with "several light coats of a 
> spray 
> acrylic or lacquer."  So he doesn't say it's necessary to seal it before 
> winding it.  Richard Quick on the other hand, says to bake it in an oven 
> overnight after wet sanding it and then coat it with polyurethane for 
> several 
> hours before winding it.  My questions: if you just dry sand the pvc do you 
> need to worry about drying it?  How smooth does it need to be (I haven't 
> gotten 
> all the scratches and nicks out of it after sanding it quite a lot)?  Do you 
> coat it again after winding? 
> Thanks for your time... 
> Jeff Johnson 
>
>