Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
Hi Skip,
I was running numbers and was about to get close to what you show
minus coupling. I showed about 1.6 times higher and likely due to
not having your actual inputs, etc.. Anyway, the cap death isn't a
shock. Your lucky the NST didn't fail on 1 side (or did it?).
Anyway, I'm curious as to what your trying to accomplish running at
resonance on such a short 1:1 h/d high Q coil? If you get a cap that
can take the higher voltage, you know the NST will be the next
death. Don't get me wrong, I like it when coilers go out there and
do something different. Just curious what your up to as know you've
been coiling for quite a while now.
I have a coil similar to yours also using 18g and a helical primary
with about 4 turns. However, coupling is about .3 or so. It was used
as a maggy driver where the 3rd coil is directly over the top of the
driver. This coil also used an aluminum disc between the driver and
the 3rd coil (corona/breakout prevention from L2). The 3rd coil was
just a small 4.5" coil but used a 9" x 30" topload. No problems
breaking out. I insulated L1 to L2 with LDPE sheeting to prevent
arc-over. I used Javatc to figure out the necessary L's and C's, but
it took some creativity to force the program to model a 3rd coil.
Freaked me out when it actually worked! The whole idea there was to
consolidate a maggy, but in doing so, the 3rd coil affects the
driver (just as a primary affects the secondary of a classic 2LC
system and just as a topload affects a secondary [lot's of stuff to
consider there]). It's a true 3LC disruptive coil with all the bells
and whistles. This showed me that numerous coil stacks and
inductances could be configured to model a single resonant frequency
(obvious conceptually and mathematically, but proved mechanically
when it actually worked).
http://www.classictesla.com/photos/hybrid/hybrid.html
Take care,
Bart