Original poster: tesla popp <teslas_lab@xxxxxxxxx>
Good question. I didn't have a secondary in it at the
time.
I now have assembeled one of the twins and I am a bit
irritated. It is only making 4' sparks at the ~15/120
I am getting from the tranny. My chokes are really
dampering A LOT of kickback. Now that the secondary
is in it, my trannys safety gap is firing at 98% full
power, which makes me leery.
Thanks for getting to the point.
Coiler forever: Jeremiah Popp
--- Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
>
> When running an NST through a Variac, the optimal
> phase setting of the
> SRSG will vary depending on the Variac setting.
> Additionally, NST's are
> not the well-behaved linear devices that intuition
> and simulation models
> would have us think. Ferroresonance occurs at
> higher mains voltages,
> causing an LTR cap to become mains-resonant, and
> draw lots of power.
> Very bizarre stuff and impossible to predict or
> model. But it does
> effectively supercharge an NST power supply.
>
> Have you metered your NST primary current? That
> will give a better
> indication of how much power is actually being
> processed by your gap.
> My 15/60 NST pulls close to 20 Amps on the
> input-side of my 120VAC
> Variac, and this is WITH PFC caps. And as such, my
> propeller gap
> spinning rod is just moderately warm.
>
> I have to ask what may be a dumb question - do you
> have a secondary in
> place and is it properly tuned? If no or no, then
> the power cannot be
> transferred to streamers, and will be expended as
> heat in the gap
> instead, which may be what you see.
>
> Regards, Gary Lau
> MA, USA
>
>
>
> > Original poster: tesla popp
> <teslas_lab@xxxxxxxxx>
> >
> > Ok, I have a 15/120 NST. My cap is 0.05uF
> > Tungstin rod got hot enough to change color.
> >
> > I ran it for 30sec and it seams like it won't get
> > overly hot if I have everything in phase. Yet,
> if I
> > run it at 70% power, it gets hot twice as fast!?
> >
> > Coiler Forever: Jeremiah Popp
> >
> >
> >
> > --- Tesla list <tesla@xxxxxxxxxx> wrote:
> >
> > > Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
> > >
> > > You didn't say what kind of power supply
> you're
> > > using? With my 15/60
> > > NST, the rotating rod gets just moderately
> warm.
> > > But I'm sure if one
> > > were using a pole pig, that may be pushing
> one's
> > > luck. You are using a
> > > shield in case things go bad, right? I
> couldn't
> > > comment on a subjective
> > > "too hot to touch" without an actual
> measurement,
> > > but it is cause for
> > > concern.
> > >
> > > Regards, Gary Lau
> > > MA, USA
> > >
> > > > Original poster: tesla popp
> > > <teslas_lab@xxxxxxxxx>
> > > >
> > > > Just set up one of my twin coils with a
> propeller
> > > > gap...
> > > > I found that after 10 seconds at 50% power,
> the
> > > > rotating tungsten rod was far to hot to
> touch!
> > > >
> > > > Should I be worried about the "heat" VS the
> > > SRSG's
> > > > plastic the case /melting the high density
> PVC
> > > that
> > > > holds the rotating tungsten rod?
> > > >
> > > > Jeez is this thing LOUD!!!
> > > >
> > > > Coiler Forever: Jeremiah Popp
> > > >
> > >
> > >
> >
>