Re: What do I do ?

["Tesla list" <tesla@xxxxxxxxxx>]

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

Hi Rich,

I would suspect so.  The problem might be if you cut the gap too 
wide, it would be hard to close it again.  I personally would try to 
play with a shorted secondary first to see if your current levels can 
be obtain.  You might experiment with the number of turns on the 
secondary being shorted. I would not, however, take turns off of the 
primary as this could cause the core to saturate.  In this 
application, volts per turn and core area are the major factors 
determining where saturation occurs.

Gerry


> Original poster: "Rich & DJ" <rdj@xxxxxxxxxxxx>
>
> Can a gap be added with a saw??? This is an old Jefferson and does not
> have an EI core and no visible shunts.
>
> Rich
>
> Subject: Re: What do I do ?
>
> Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
> I suspect the problem is the NST with primary only.  The inductance
> would be high with little current going thru it if you removed the
> secondary and didn't add any gap to the EI core.  The current allowed
> would be the same as the current thru a working NST of the same
> design with the secondary opened (probably not much current).  When
> you added a secondary using 7 turns of 10 gauage (presumably
> shorted), this allowed current to flow thru the primary.
>
> Gerry R
>
> >Original poster: "Rich & DJ" <rdj@xxxxxxxxxxxx>
> >
> >I am trying to get a transformer and ballast set up with just a
> >spark gap for now. It is multi gap copper tube set up, 8 tubes
> >total, 5 tubes in use @ .050 each .200 gap.
> >The first ballast try was with a roll of 12 ga w/steel core and a
> >NST transformer core with just the primary, when I ramped up the
> >supply voltage it would barely fire when I got up to 95% on the
> >voltage at the transformer input. I added 7 turns of 10ga for a
> >secondary on the NST core, now I get good sparks at 60% voltage.
> >Can any one tell me why ?
> >I am using the roll of wire and NST core to limit my transformer to
> >1.95Kva max. It is all trial and error at this end , should I add
> >more turns on the NST secondary until I get null spot.
> >  I am getting actual  8 amp at the input of the transformer at 140v
> > , max s/b 8 amp at 240v.
> >I have a volt and amp meter at the transformer input.
> >I think I would be better off with more volts and less amps or ????.
> >
> >Rich , from the middle of Missouri
> >
> >