Re: Tesla first start up problems. (fwd)

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Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sun, 10 Dec 2006 18:09:03 -0700
From: resonance <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Tesla first start up problems. (fwd)



Sounds like you are not in true resonance between pri and sec.

It's very possible you have too few primary turns to hit resonance.  Use 
some scrap wire --- set up approx 20-25 turns and then try your tuning 
efforts again leaving a sharp pointed wire sticking off the toroid.  Keep 
your max variac setting to 30-40% during these tuning sessions --- never run 
it all the way up or you could damage something.

The 0.1 uF value sounds very high for a saltwater cap bank.  Take a few 
bottles to a local tech college and have the electronics instructor test one 
for you with a digital capacitance meter.  If you live in a larger town with 
a university, someone in the research dept would also have a cap meter to 
help you test it.  Knowing your exact cap value you can use JAVATC to dial 
your coil in.

Be sure to use a Terry filter to prevent damage to your nst.

Your can go online free and use Bart Anderson's excellent "JAVATC" program 
to run all the parameters of your coil.  It is very accurate and will show 
you exactly where your error is.

Dr. Resonance
>
> I am new to this mailing list but I was hoping that someone might be able 
> to
> help me out with some problems I am having with my newly built tesla coil.
>
> A rough spec of my coil is as follows,
>
> 15KV 30ma NST
> 14 turns on the primary, 1/4in copper tubing spaced at 1/4in
> 6 inch diameter secondary, 24inches of windings, approx. 900 turns.
> 4 inch topload made from aluminum tubing
> Beer Bottle / salt water cap. 12 bottles, approx 0.1uF
>
> I checked and double checked everything and then decided to run it outside
> at night.  The spark gap was sparking with a considerable amount of power
> however that was all that was happening.
>
> I took the top load off at one point and left just the end of the 
> secondary
> winding sticking up.  When I did this the end of the wire had a slight
> corona and about a 1/4 inch spark emitting from it.
>
> There were no coronas in the beer bottle cap even though I didnt suppress 
> it
> with oil yet.
>
> I tried tuning it and tried running it on about every turn of the primary.
> It just seemed to be really lacking in power.
>
> Any advice would be most helpful.  I would love to get this coil going!
>
> Kind regards,
>
> Trevor
>
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