Re: [TCML] NST Terry filter

[<ConorPerry@xxxxxxxxxxx>]

I bought this same kit and was happy with it.  Nice guy, quick shipping.  I 
added some 3/4" threaded brass balls from "ToolSupply" on ebay, just search 
for "brass balls threaded" and you'll get lots of hits.  He sells a set of 5 
for $22 with shipping.  5 is nice because you'll use 3 on the Terry Filter, 
then the other 2 you can use as a spark gap, or protection gap accross the 
NST.  You can see some pictures of my build at the end of this video: 
http://www.youtube.com/watch?v=Rj5a3vuxihQ

CP8071


----- Original Message ----- 
From: "Paul Brodie" <pbbrodie@xxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Tuesday, December 08, 2009 8:36 PM
Subject: Re: [TCML] NST Terry filter


> There is a complete Terry Filter kit advertised on eBay nearly all of the 
> time for $58.80 plus $14.35 shipping. It includes the following parts:
> (2) 100 watt 1K ohm Dale resistors
> (16) MOV's 1800V  (Metal Oxide Varistor)
> (12) 0.0033uF 1600V Metal Polypropylene Capacitors
> (12) 10M Ohm 1/2 Watt 5% Resistors
>
> It is offered by the eBay store, Teslastuff, which is Rainy Lake 
> Electronics.
> Just go to eBay and search for "Terry Filter" and it will come up. There 
> is a complete Terry Filter for sale on eBay right now, too. It is 
> completely assembled and has a safety gap made from brass balls.
> Paul
> Think Positive
>
> ----- Original Message ----- 
> From: "Lau, Gary" <Gary.Lau@xxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Tuesday, December 08, 2009 8:51 AM
> Subject: RE: [TCML] NST Terry filter
>
>
> No, the resistors cannot be replaced with chokes of any kind.  The 
> resistors are an integral part of the R-C low pass filter.  The R-C filter 
> is specifically designed to avoid the resonance that any L-C filter would 
> have. Filters using chokes were widely used until a more thoughtful 
> analysis and simulation was performed, and it then became apparent that 
> L-C filters cause more problems than they solve.  See more comments and 
> analysis of NST filter networks at 
> http://www.laushaus.com/tesla/protection.htm
>
> But yes, you can use the two ceramic caps instead of the string.
>
> Regards, Gary Lau
> MA, USA
>
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf Of Jeremy Chan
> > Sent: Tuesday, December 08, 2009 8:20 AM
> > To: TCML
> > Subject: [TCML] NST Terry filter
> >
> >
> > Hey all,
> > I am trying to build a terry filter for a 15/30 NST according to the 
> > following
> > diagram:http://www.classictesla.com/download/NST_Filter.jpgbut am having
> > problems finding the 1K 100W resistors.What is their function, and would 
> > chokes
> > wound using flyback cable rated at 40KVDC on ferrite cores help in 
> > filtering out the
> > hf? If so, how many turns on the chokes would be required?Also I plan to 
> > replace
> > the cap and 10M resistor string with 2 1nF 15KV ceramic caps in series on 
> > each
> > side to give 30KV 500pF sans the 10M resistors. Is that workable?
> > Thanks and regards,Jeremy
>
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