RE: half filter?? and what all I need before primary circuit

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>

If you're referring to.001uF/10kV ceramic disk caps, All Electronics no
longer lists that in their catalog.  Too bad - at just $1 each they
would have been an excellent candidate for use in a filter.

I'm not sure that the cap used in an R-C filter is as critical in terms
of its HF characteristics as the main tank cap.  The HF current is low
since it's limited by the series resistors.  And, OK, I *like* the way
the doorknobs look!  And there's no shortage of them on eBay.

Thanks for the paper-plug.  There's a serious shortage of technical
explanation on this topic!

Regards, Gary Lau
MA, USA


>
> Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
>
>
>
> If you want to replace the doorknobs which were not really design to
> bypass the RF, consider All Electronics .01 uF 10 kV units.  Compact
> in size, usually 4 or 5 of them in series off each bushing to
> ground,gives a nice fast bypass due to their lower capacitance, don't
> steal much energy, and are very inexpensive by the bagfull.
>
> Nice paper Gary --- good design ideas.
>
> Dr. Resonance
>
> >I have written a very detailed web page about the how's and why's of
> >protection networks - see
http://www.laushaus.com/tesla/protection.htm.
> >
> >Foremost, forget about chokes.  In order of descending importance
(IMO),
> >you want:
> >1) Properly set main gap width.  No, it's not part of the filter
> >network, but a too-wide main gap is the single greatest cause of NST
> >failure.
> >2) Safety gaps, properly set.  Of course if you just open them up,
then
> >they're useless.
> >3) Series resistors AND bypass caps from NST bushings to case.
Having
> >just the resistors is useless, sorry.
> >4) MOV's.
> >
> >Are the caps really more expensive than the MOV's?  Since you're
using a
> >9kV NST and not a 15kV NST that the filter was designed to
accommodate,
> >you could use fewer, smaller caps to save a little bit.
> >
> >Regards, Gary Lau
> >MA, USA
> >
> >
> > > Original poster: "Langer Giv'r"
<transworldsnowboarding19@xxxxxxxxxxx>
> > >
> > > Hi, i was wondering instead of using the entire terry filter
design,
> > > could i just use the MOV's, safety gap, and resistors,  and leave
out
> > > the highly expensive caps and still get a relative ammount of
safety?
> > > if not... what is the best way to get protection for my 9KV30mA  "
> > > cheaply and effectively "
> > > what is all you need basically before you send off the power
towards
> > > the tank cap and spark gap?  like filter / RF chokes / safety gap?
i
> > > am still a little confused and before i buy the parts (I am poor)
i
> > > would really like to know what all to buy.   Thanks a million!
> > > Daniel from Canada
> > >
> >
> >
>
>