Re: open circuited NST's, was ICE vs Water/dielectric comparison

[FutureT-at-xxxxxxx (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

In a message dated 11/11/00 8:43:10 PM Eastern Standard Time, 
tesla-at-pupman-dot-com writes:

Ralph,

I don't know of any special test, but I have also seen NST's that check
out OK on the bench, but fail to give sparks in a coil.  I've resorted 
to testing NST's in an actual coil.  Yes, I attribute it to tar breakdown
when running in the actual coil.

John Freau
--

> Henry, John,
>  I recently posted on a related subject; your topic comes as close to a 
>  response as I have seen. I was running a 15/30 in parallel with a 15/60 
and 
> a 
>  52 uF PFC. I was getting
>  a 20 inch spark from my bipolar. The coil was working perfectly in June. I 
>  didn't turn it on again until October and the coil had totally wimped out. 
I 
> 
>  started replacing the NSTs
>  and the MMC. I finally got the coil fired up with a new set of 
transformers. 
> 
>  My problem is that I do not know what happened to the NSTs or how to prove 
>  it. Is there any way to test
>  an NST with the HV connected and operating under load? On the bench, the 
> NSTs
>  all check out. They are correctly phased, the DC resistance's check out, 
and 
> 
>  the HV side
>  arcs each side to case ground and across the entire winding.
>  
>  Happy day,
>  Ralph Zekelman