Re: Secondary catastrophe

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

Original poster: "Gregory Hunter" <ghunter31014-at-yahoo-dot-com> 

Forget about splicing. Cut off the bad part and don't
look back. 17" is plenty. I once wound an 18"
secondary on 4" sch 40 PVC pipe. (Visit link for a
picture of it):

http://hot-streamer-dot-com/greg/jig.htm

Driven with a pair of MOTs and a voltage doubler, it
pumped out fat, 42" sparks on a regular basis. It
never even thought about failing. I wound that little
secondary for starving college student, and as far as
I know, it is still making fat sparks somewhere.

12/30 NST power? Your 4" x 17" secondary won't even
break a sweat. The amputation will raise the frequency
a little. Big deal. Chop it off!

--- Tesla list <tesla-at-pupman-dot-com> wrote:

 > Original poster: "andy g" <aggniu-at-hotmail-dot-com>
 >
 > Hello again,
 >
 > I may be asking a question that has already been
 > answered and that I think
 > I might already know the question to, but I will
 > fire away anyhow.  I am
 > still in the process of building my first coil, and
 > the other night I
 > started working on the secondary coil.  I am using a
 > piece of 4"(nominal)
 > 4.5"(O.D.) PVC for the form (I know it is quite
 > lossy, but I am a poor
 > college student) wound with 22AWG magnet wire.  At
 > any rate, I finally got
 > the thing done and was going to coat it with poly
 > the next morning as I
 > didn't have any on hand, and I came to find after
 > letting it sit for a
 > while I had spots where the wire wasn't completely
 > flat on the form (kind
 > bunched up where there wasn't enough space between
 > windings/there was too
 > much wire and nowhere for it to go).  So, you can
 > all see where this is
 > going, I ended up getting a mess of doubled over
 > windings and a hell of a
 > headache at about 1:00AM.  By the time I went to
 > sleep, the gosh darn thing
 > looked like a backlashed fishing reel.  The good
 > news is that I saved all
 > but the last 4" of windings.  My question is, should
 > I take the time to try
 > to do a splice (rewinding is out of the question, I
 > don't have enough wire
 > to redo the entire thing)? Or, should I cut my
 > losses and settle for a
 > shorter than expected secondary?  If I do use a
 > shorter secondary, what
 > sort of performance change could I expect?
 > Originally, it was going to be
 > 21" of windings.  Now, it is a shade over 17" of
 > good windings.  If it
 > would be possible to splice, what is the appropriate
 > way to approach such a
 > thing to make it perform optimally?  For what it is
 > worth, at this point I
 > am locked into using a 12KV 30mA NST for power,
 > otherwise, no values are
 > definite.
 >
 > _
 >
 >
 >


=====
Gregory R. Hunter

http://hot-streamer-dot-com/greg

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around
http://mail.yahoo-dot-com