Newbie cap and topload questions

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: jvillecheesehead@xxxxxxxxxxxxxxxx 

Hi,
I'm a first time coiler and it took until now for me to finally discover how
useful this list was.  Anyhow, I am using a 15kv 20mA nst and have wound my
secondary of 4" diameter 20" height with 800 turns of 23 gauge wire.  My
question is about a couple options with caps.  First, I am assuming 
this 35,000V
.005uf cap from Electronics Goldmine for $2.75 is not suitable for tesla coils
as the site claims and wanted to confirm this.  Here is a link:
http://www.goldmine-elec-products.com/prodinfo.asp?number=G15589&variation=&aitem=72&mitem=91
 My other plan was to use this Phillips 1600V .047uf cap that runs 
for a buck a
piece at the same site:
http://www.goldmine-elec-products.com/prodinfo.asp?number=G14832&variation=&aitem=67&mitem=91
 According to an excel calculator, I believe using Terry Fritz's 
data, the best
reliability/price point would be 2 strings of 19 of these caps.  Upon reading
some other posts it sounds like some people push them harder without any issues
and was wondering if anyone had an opinion on this.

I also had another quick question about the topload.  For some reason in my
planning (which was a few months ago, couldn't work on the coil while I was at
college) I decided to use a toroid with 3" diameter Al ducting with a total
diameter of about 10 inches.  Using Barton Anderson's JavaTC calculator this in
combination with my other components results in a 390kHz resonant frequency.
The size and frequency differs from many of the coils I have seen 
online and was
wondering if there is any problem with using it.

Lastly, I thought I would share a picture of my spark gap that 
includes a simple
modification to the Richard Quick design that allows for increased
adjustability.  Thanks for the help!