Re: SIZE of RF chokes?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi JT,

Do what you may, but you have a 30ma tranny and I^2 R is 1 
watt.  There will be other sources of power dissapation in the 
resister but I dont think efficiency is a reason to not protect the 
NST.  Your first line of defense is a properly set safety gap.  This 
will help the overvoltage but RF tracking in the NST's tar can still 
be a problem.  If you do kill the NST, try to melt the tar to cure 
the carbon tracks.

Gerry R.


> Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>
>
> adding a massive resistance will only make my entire system less 
> efficient. It will reduce my current by...i am not sure, .5 to 5 percent
>
> *****I would love a terry filter, but unfortunately i am a 
> perfectionist, and have made my coil look very good. As a 
> consequence of this, MANY components are very close together.
>
> -I DOUBT I HAVE ROOM FOR A TERRY FILTER, NOT TO MENTION THE $. I 
> have about 2" by 3.5" of space for a protection circuit
>
> I can send TONS of images of my coil, and safety circuit. Want to see them?
> Ill send some photos of the available space for my safety circuit too.
>
> ***** believe it or not, i dont know what LTR means.
>
>
>
>
> > From: "Tesla list" <tesla@xxxxxxxxxx>
> > To: tesla@xxxxxxxxxx
> > Subject: Re: SIZE of RF chokes? Date: Wed, 16 Nov 2005 18:27:16 -0700
> >
> > Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> >
> >
> > Toss the chokes and add about 1000 ohm 100 watt resisters (one in 
> > each leg). Chokes use to be used but it has been shown that they 
> > can cause more problems than they solve due to parasitic 
> > resonances.  You may want to search the archieves for the "Terry 
> > Filter" to properly protect your NST. Also LTR operation is 
> > recommended for NST's  (1.6*Cres for static spark gaps and 2.8*Cres for SRSGs)
> >
> > Gerry R.
> >
> > > Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>
> > >
> > > I have read .1 to .3 millihenries.
> > > On one of your threads, I just read .03 millihenries (30 micro)
> > >
> > >
> > > PLEASE tell me- are my choke the right size.
> > >
> > > -I have a 12,000 30ma neon, 60Hz
> > > -Close to resonant capacitor (supposed to be 6.66nF, but its 7.8nF)
> > >
> > >
> > > * My chokes currently are set up on BOTH sides of my HV circuit 
> > > (both outputs of xformer)
> > > * Each choke measures 7.4uH
> > > * Both chokes are 80 turns of 19gauge wire, on an aircore form, 
> > > .25 X 1.5" long
> > >
> > > USING THIS...RANDOM..INFORMATION, CAN YOU TELL ME WHAT SIZE OF 
> > > CHOKES I NEED, AND ARE MINE THE RIGHT SIZE ALREADY.
> > > -----------------------------------------------------------------------------------------------------------------------------------
> > > Plus: my safety gap fires frequently, but not too much. When it 
> > > fires it becomes the sparkgap.
> > > *So, should i make a SECOND safety gap after the first?
> > > *Or, is it ok to fire as the sparkgap. In otherwords, when it acts 
> > > as sparkgap, will overvoltage occur in my neon?
> > >
> > >
> > > my safety sircuit is set up as:
> > >
> > > transformer - connects to safety gap - connects to 7.4uH air 
> > > chokes on both sides - rest of circuit
> > >
> > > I KNOW I TYPED A LOT, BUT I NEED PEOPLE TO ANSWER ALL, OR MOST OF 
> > > MY QUESTIONS. PLEASE ANSWER MY WHOLE EMAIL.
> > >
> > > Thanks.
> > >
> > > _