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Re: No Terry filter

Original poster: "david baehr" <dfb25@xxxxxxxxxxx>

I have never used any protection between neons and the coil,...other than maybe a safty gap, with only a couple of failures over many years,(static gaps )... BUT , I usually ran 2 or more ne transformers at a time , is there safety in numbers ?? Any kickback would be absorbed by the many transfrmers ? Now Im on mini pig power................

>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Re: No Terry filter
>Date: Fri, 29 Apr 2005 07:42:53 -0600
>Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>
>I've seen some 1-2 kVA "piglets" every now and then (prob 75-100lb
>each). They are rated 7.2kV and have the same 110 kV BIL rating.
>Wonder how many of these in series (like mots) I could go before
>something arced internally? I've done 2 of the 14.4 kV ones before
>(before moving on to x-ray ones, cheaper voltage on ebay), but
>midpoint-grounded the secondaries like an nst.
>----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
>To: <tesla@xxxxxxxxxx>
>Sent: Thursday, April 28, 2005 9:59 PM
>Subject: Re: No Terry filter
>>Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
>>Dan, all,
>>Well, I can speak from the other end of the spectrum on this issue.
>>I've suffered failure just about every time that I have used an NST
>>without a "Terry filter". Sometimes even if I kept the spark gap
>>conservatively spaced and the primary cap considerably LTR, the
>>NST(s) that I used still wanted to go "pift". Maybe I just had bad
>>luck with getting NST "lemons". That's one reason that I ended up
>>going more for a pole pig. Not only are pole pigs practically
>>bullet proof (I've NEVER had one of these to fail no matter how
>>much abuse I give it), they are also very powerful and thus are
>>for LONGGGG sparks ;^)
>>----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
>>To: <tesla@xxxxxxxxxx>
>>Sent: Thursday, April 28, 2005 1:49 PM
>>Subject: RE: No Terry filter
>>>Original poster: "Mccauley, Daniel H" <daniel.h.mccauley@xxxxxxxx>
>>>For what its worth, i have built many NST powered tesla coils
>>>from 4kV/20mA up to paralleled 15kV/60mA NSTs.
>>>I NEVER use safety gaps or terry filters and never had a failure.
>>>also push my coils particularily hard.
>>>I did build a Terry filter once, but sold it right afterwards and
>>>really used it.
>>>My 0.03 cents