RE: KVA Model 9J

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Justin,

I saw the 9J in Denver.  It is built really really well and super nice!
All top of the line stuff.  Looked like they did everything right...

Jeff previously told of the coil (I hope it's not a secret now :-)))

http://www.pupman-dot-com/listarchives/1999/October/msg00408.html

If it is firing at 480 BPS at 20kV firing voltage with 0.2uF primary caps,
we can calculate an input power of 19.2kV.  The controller is designed for
20kVA

Using John's formula, it should give 19.6 foot arcs which it does.

So no magic.  Just great design, construction, parts...  The transformer is
10kVA operated at 2X that power which is probably just fine considering the
duty cycle of a TC.  It is one of those coils that is just perfectly built.
 I see that Bill's site states it is 5kVA which means he might have been
using a 5kVA pig.  Back in 1981, measuring the input power of a coil was
not nearly so clear as it is today so maybe those old numbers were a bit
off ;-)

Jeff's version of the model 9 beefed it up and made some changes in light
of newer in that it has a larger toroid, beefier primary circuit, and a
higher BPS rate.  Seems to have worked perfectly.  "I" would have gone to
120 BPS with 4X the primary cap, but Jeff's seems to work OK anyway ;-)))

Cheers,

	Terry
 

 

>Hello All.........
>
>I have never asked kVA Effects' staff a question about their equipment as 
>many times as I have wanted to. I know ya'll are very busy, and I have not 
>wanted to distract. Please allow me to publicly ask one question, one that I 
>have been wondering about for at least a few months now.
>
>Alright - I've seen and made all kinds of different coils in all kinds of 
>different configurations. In every case, I make a comparison between two 
>things: 1). How it's made. 2). How long the sparks are. We all know this is 
>the key to making a better performing coil.......
>
>It is stated on kVA Effect's website at www.ttr-dot-com that the model 9J arcs 17 
>feet with 5kVA of input power. (I think this coil is on the other site too, 
>I'm not sure).
>
>And my question is ----- how was this done? There must be something at work 
>here.
>
>This kind of efficiency (especially in a larger coil system) is quite 
>impressive to say the least. How was the power measured? Is this an amp-clamp 
>on the input to the pig, or a calculated value? 
>
>Perhaps this is some incredibly careful selection of components values (ex. 
>cap size and break rate) that work together perfectly. I notice several 
>wonderful things (on the website) that are apparent in all of kVA's coils. 
>Just at a glance, I notice that a standard "high-current RF" wiring technique 
>is used which includes short, heavy wiring from component-to component and 
>"modular" construction. Also, all key components are massively overrated for 
>efficiency and lifetime. What I'm curious about are things that are NOT so 
>evident in the pictures, which contribute to the 9J's efficiency.
>
>Let me know so I can see WHY our coil arcs 9 foot with 6kVA in. ; (
>
>Take care, thank you.
>
>Justin Hays
>KC5PNP
>G-3 #1150
>Email: pyrotrons-at-aol-dot-com
>Website: www.hvguy-dot-com
>