Re: Letting the smoke out of a Terry Filter

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Jonathan,

If the MOVs were smoking, there is a very good chance they all need to be
replaced.  I imagine the cases are a little cooked and cracked.  They
cannot be tested easily.  The resistors and caps are fine perfectly fine.

The safety gaps should have been firing like mad before the MOVs burned up?
 Be sure they are set correctly.  Sounds like the coil was resonating up
the primary voltage far too high.  If you are using resonant sized caps,
maybe go to LTR especially if you are experimenting with different gaps
that my not fire properly.

Sounds like the MOVs save the NST the "hard way" :-)

Cheers,

	Terry


At 04:11 PM 7/26/2001 -0700, you wrote:
>Howdy all,
>
>Well, I couldn't wait to play with my new three horned sucker gap, so away I
>went. Couldn't get it to work real well, it seems my trigger circuit isn't
>firing reliably. So I decided to see how the THSG worked as a multi-static
>gap. I was tuning away, when I looked over I saw smoke rising from my Terry
>filter!!
>
>So Terry, do you have the values for the MOV string and so on? So I can see
>what is left. I'm sure the power resistors are ok. Digikey is gonna love me
>:-(
>
>Before the smoke session, I noticed the sparks were getting close to normal
>length, but were much less intense, and were softer and more snake-like than
>normal. Sort of waving about instead of mad jagged bolts. Any ideas what
>causes this behavior?
>
>Thanks, yet again again,
>
>Jonathan Peakall
>
>
>