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Re: NST Terry Filter's

Original poster: Mark Broker <mbroker-at-thegeekgroup-dot-org> 

Indeed, Dr. R.

As I recall, the original "Terry Filter" had 25W or 50W resistors but a few 
complaints arose, particularly from people with 60mA and higher NSTs, that 
the resistors got too hot.  The 100W resistors on my filter only got hot 
when the TC was out of tune or the RSG was out of its sweet spot.  When it 
was in proper tune, the resistors barely got warm from the 15/90 NST supply 
(about 8W).  Remember that resistors were designed to run hot and have a 
max temp in their spec sheet.  This is "more true" for power 
resistors.  Just make sure to keep an ample air space and air flow to keep 
things in the surrounding area from cooking.


Mark Broker
Chief Engineer, The Geek Group

On Fri, 02 Apr 2004 19:06:46 -0700, Tesla list <tesla-at-pupman-dot-com> wrote:

>Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> If you keep your 
>duty cycle reasonable like 30 sec, you can get away with 25
>w resistors or even two 10 watt units in series --- just adjust the values
>to have the same resistance.
>Dr. Resonance
>Resonance Research Corporation
>E11870 Shadylane Rd.
>Baraboo   WI   53913
>  >
>  > I have just purchased a 12/30 NST for my first TC, and have been reading
>  > about the "Terry Filter".  It is a great design - the only problem that I
>  > am finding is locating parts in Australia.  Things such as 100W resistors
>  > and the HV capacitors / MOV's.  If there are any coilers out there in
>  > Australia that have managed to locate these, would they mind letting me
>  > know where?  Also, are there any advantages in different sized / shaped
>  > electrodes?  I am assuming there would be due to electron distribution
>  > fields, but were wondering how this actually effects voltage / spark size.
>  >
>  > Many Thanks
>  > Tristan
>  >
>  >
>  >
>  >
>  >