Re: Microwave parts coil (need help please!!)

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

Original poster: "Gregory Hunter by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>

Hi Tom,

Based on your comments, I think the tank cap is too
big. Remember, as the tank cap gets bigger, you need
fewer turns on the primary to get in tune. Your tank
cap may be so big at .31uF, that even one primary turn
is too many, making tuning impossible. Your new tank
cap is 31 times bigger than your original .01uF cap,
so your primary turns should decrease in proportion.
Got any more MOT caps you can put in series? A wide
topload with a breakout point might help, as the added
"top hat" capacitance might get your primary turns up
to at least one. It's worth a try.

It might not be possible to get good performance from
your existing secondary using 4kvac MOT power. You
might have to build a new Tesla coil optimized for the
MOT supply in order to get good results. I've learned
by tinkering that low voltage/high current MOT coils
are special beasts, requiring a design approach
different from that of NST-based coils.

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

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Tom Stathes by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <newphreak_16-at-yahoo-dot-com>
> 
> Hello all,   
> 
> I recently draged home some microwave ovens from
> trash
> nite.  
> 
> long story short, i used the 2 MOTs in series, for a
> tank supply, i used the blower motor of one to make
> a
> nice RSG.  I used 3 microwave oven caps in series
> for
> about .31uf 6kvac.
> 
> My problem is that i cant get any visible output on
> my
> coil.  I origonaly had a 10kv 133ma suply on it with
> a
> .01uf cap  and a static gap. I was getin 21in arcs
> of
> of it.  Now the only way i know that there is hv
> produced is when i put a flourecent tube on the
> topload it glows dimly.  I know my problem is my
> coilk
> is out of tune, but no matter how many turns i tap
> it
> at it still wont arc to anything.  
> 
> I think i need a bigger topload, this would increase
> the number of turns i would need to tune it,
> correct??
>  The bulb seems to get brighter when i use less
> turns,
> but i obviously cant go less than 1 turn.   
> 
> 
> Thanks for any help you can give.
> --Tom
> 
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