Re: Hot Primary

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gregg Adams by way of Terry Fritz <twftesla-at-qwest-dot-net>" <network-at-nexband-dot-com>

I'm just waiting for it to get dark and I'll try the following:

Increase the primary/secondary coupling
increase the topload

Currently, my topload is two 4" x 16" aluminum duct

I'll give these a try and also I'm going to wrap a new 6" as suggested by
someone.

Thanks everyone



----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, July 03, 2002 3:28 PM
Subject: RE: Hot Primary


> Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Gary.Lau-at-hp-dot-com>
>
> OK, I was afraid you might have been running a pig through a 22 gauge
> primary or something silly like that, but things look for the most part
> pretty reasonable.  The one thing I note is that your primary is a fairly
> low inductance with only three turns.  This is bad on several fronts:
>
> 1) Low inductance primaries result in higher losses in the spark gap.
> 2) Pri-sec coupling may be lower than optimal.
> 3) Low inductance primaries result in higher resonant frequencies, and
> higher frequencies result in higher resistive losses in conductors.  This
> means the primary may run hotter.
>
> When you said you have to run a lot of topload, how much do you have?
More
> is generally better.  Increasing it further would lower the frequency and
> make you use more of your primary; that's what I would try.
>
> Regards, Gary Lau
> MA, USA
>
>
> Original poster: "Gregg Adams by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <network-at-nexband-dot-com>
>
> To all who responded to my question, thanks and here's the specs on my
coil:
>
> Secondary: 4.25" / 22 gauge / 22 inches in length
> Primary:  flat sprial / .25inch copper tubing / tapped at 3rd round out
> Power supply:  dual MOT's with voltage doubler(12kv) / not sure on the
> amprege
> Tank cap:  .05uf -at- 12kv / 2 strings of 6 geek caps(.15uf -at- 2kv) I have
more
> just not hooked up.
> Spark gap:  ARSG / 10k rpm angle grinder w/6 inch disc and 4 contacts
> Performance: 40+ inches
>
> My primary is getting hot enough that you can't leave your hand on it for
> more than a few seconds.  Also, I'm having to run alot of topload now.
>
>
>
>
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Tuesday, July 02, 2002 9:53 PM
> Subject: RE: Hot Primary
>
>
> > Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <Gary.Lau-at-hp-dot-com>
> >
> > It depends.  What exactly is your primary made out of and what is your
> > power supply?
> >
> > Gary Lau
> > MA, USA
> >
> >  -----Original Message-----
> > From: Tesla list [mailto:tesla-at-pupman-dot-com]
> > Sent: Tuesday, July 02, 2002 3:05 PM
> > To: tesla-at-pupman-dot-com
> > Subject: Hot Primary
> >
> > Original poster: "Gregg Adams by way of Terry Fritz
<twftesla-at-qwest-dot-net>"
> > <network-at-nexband-dot-com>
> >
> > Hey all,
> >    What would be the cause and cure for a primary getting hot?
>
>
>
>