Re: Questions from a newbie in Australia

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

Original poster: "David Knaack by way of Terry Fritz <twftesla-at-uswest-dot-net>" <dknaack-at-rdtech-dot-com>

> Original poster: "Stacy Gillett" <sgillett-at-hotmail-dot-com>
> 1.  Instead of a single NST, I have two 15/25 units.  The problem is that
> they both have one side of their secondaries shorted (in effect, they can
> only put out about 7500V each).  The guy at the sign shop I got them from
> said that I could get 15kV out by tying their centre-taps together and
> taking the HV from each of the good secondaries (the bad sides are not
> connected to anything).  Assuming that I had the primaries wired up in
> parallel and in the correct phase, would this arrangement work?

I'd be inclined to unpot them and dunk them in oil to see if
the dead sides would come back first.  If only one comes back
you've still better off, and if both come back, you can parallel
them for 15/50.

> 3.  As I can't really afford a Variac at the moment, I was planning on
using
> a 100W light globe in series with the mains input so as to lower the NST
> output voltage until I had tuned the primary.  Quick and dirty though it
is,
> is there any reason why this wouldn't work?  If it would, is 100W in the
> ballpark for the globe wattage?

You can put in whatever wattage you wish to use, the transformer
will not draw more power than the rating on the globe.  A 25W
globe will limit the total draw of the light and transformer to
less than 25W.

DK