Re: SIZE of RF chokes?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>

but, my variac outputs, or will only take, 4 amps of current, at 
120VAC. So wont hiring out voltage to 140 VAC, output only 3.33 amps? 
The power throughout will still be exactly equal


> From: "Tesla list" <tesla@xxxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Subject: Re: SIZE of RF chokes?
> Date: Sat, 26 Nov 2005 17:00:11 -0700
>
> Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
> Hi Gary,
>
> I agree,  if you leave your safety gap setting based on 120Vac then 
> no more voltage (I take full advantage of 140Vac and set the safety 
> gap based on 140V - others may not).  140Vac may run the NST closer 
> to saturation and thus the current could be higher but not the 
> voltage if the safety gap is set at 120Vac.  I have never heard of 
> an NST failure due to current only voltage.
>
> Gerry R.
>
> > Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
> >
> > Although intuition suggests that running an NST at 140VAC is more
> > stressful than at 120VAC, I can't think of an actual reason why.
> >
> > I say crank it to 140V and enjoy!
> >
> > Regards, Gary Lau
> > MA, USA
> >
> > > Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> > >
> > > Hi JT,
> > >
> > > There are never guarantees with using NST's in TC service.  Many if
> > > not most members in this group run the input of their 120Vac rated
> > > NSTs at 140Vac. Do what you are comfortable with.  If you have a NST
> > > that is rated at 120Vac_in 12KV_out, then this NST will generate
> > > 14KV_out with 140Vac_in. Remember, these are rms voltages.  If you do
> > > plan on running your NST at 140Vin, then set your safety gap with
> > 140Vin.
> > >
> > > Gerry R.
> > >
> > >
> > > >Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>
> > > >
> > > >So, you're saying i can run my transformer at 140VAC in, and as long
> > > >as my safety gap is set correctly, I dont have to worry about
> > destroying it?
> > > >
> > > >sweet. Except ,it is a linear relationship right? if i increase my
> > > >input voltage by 1/6 previous voltage,
> > > >I should get in increase of 1/6 voltage on the secondary right?
> > > >
> > > >That means if i wire my NST for 140VAC in, 14KVAC comes out, correct?
> > > >
> > > >
> > > >>From: "Tesla list" <tesla@xxxxxxxxxx>
> > > >>To: tesla@xxxxxxxxxx
> > > >>Subject: Re: SIZE of RF chokes?
> > > >>Date: Thu, 24 Nov 2005 10:38:59 -0700
> > > >>
> > > >>Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> > > >>
> > > >>Hi JT,
> > > >>
> > > >>Excessively high voltage is what usually kills NSTs.  Use LTR cap
> > > >>value to avoid resonant charging and a properly set safety gap to
> > > >>avoid these high voltages.  Yes 140Vac will probably shorten the
> > > >>life of an NST to some extent.  If you have a properly set safety
> > > >>gap and an LTR cap value,  you probably shouldn't  worry about this
> > > >>too much as you wont enjoy the hobby as much.  I run my 15 KV (21
> > > >>KVpeak) NST's at 25 KVpeak with a SRSG and haven't lost one yet.
> > > >>
> > > >>Gerry R.
> > >
> > >
> > >