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Re: [TCML] Secondary and Primary Assistance

Hi Mike,

As others have already mentioned, you need to provide
more vital info on the specs of your coil before they can
really start to give well informed advice. Also, I noticed
from watching your video that your stike rail is set WAY
too high and is obviously causing a serious problem
with racing sparks up and down the surface of the se-
condary coil to the strike rail. You need to either lower
or completely remove the strike rail to help alleviate
this problem, as racing sparks left unchecked will event-
ually damage and destroy the secondary coil.  And this
can happen PDQ with efficient, high powered coils.There
has been discussion in recent months about whether a strike
rail was even necessary.

David Rieben

----- Original Message ----- From: <Mddeming@xxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, March 15, 2008 10:33 PM
Subject: Re: [TCML] Secondary and Primary Assistance

Hi Mike,

As you may have guessed, there is a lot of critical information missing from
this description.

1) Your MMC cap bank appears to be one string of 16 caps. What size, type
and voltage rating are they?

2) Your primary coil: One needs to know the inner as well as the outer
diameter, and the spacing between turns. e.g. If it's 1/4" tubing on 1/2" centers
then the spacing is 1/4".

3) Secondary: What is the diameter? Can you take a magnifying glass and
count the turns in one inch?

4) Spark gap seems to be mounted through a wooden holder. If so, this is
bad. Wood can be conductive at high voltages.

5) Toroid. OK, it's 4" material, but what diameter? This is a critical

Without this info, meaningful advice is almost impossible.

Matt D.

In a message dated 3/15/08 8:26:53 P.M. Eastern Standard Time,
mike8675309@xxxxxxxxx writes:

I am  very new to coiling.  It is something that my Father and I  talked
about doing many years ago, but never found time to do something  like
that.  Recently I found someone selling a coil they had  started
building, but hadn't quite completed.  He had all the  components.

Now last year I completed the construction and fired  it.  It worked
OK, but I knew I really didn't know what I was  doing.

My main issue is I have a secondary that the original  construction of
is unknown.  Thus it is difficult for me to verify any  numbers.  Also
my secondary took some hits, and I would like to wind a  new one. The
actual device itself is also kind of large, so my goal is to  re-wire
everything to make it more compact, and then create a new primary  and
secondary that is optimized for the NST I have.

So I find myself  with 3 questions:

#1- What is an optimum design for a static spark  gap?  Copper pipes?
Brass knobs?  titanium electrodes?
#2- For  my equipment, either What would my optimum primary layout be,
or how would  I calculate this?
#3- Based on the primary design what would my optimum  secondary be or
how do I calculate this?

Thank you for any  assistance
Mike H.
Farmington, MN

Details on what I have to work  with:

Some pictures of the components Here:

Video  of the first fire last fall.

Transformer  is:
Franceformer 12030P
120v NST 12000v 30mA, 360VA

I am using a  NST filter based on the Terry Filter design:
12 CAPS  1.6KvDC
2 1kohm 100W resistors
Dual Safety Gaps

My Spark  Gap
Brass Cabinet Knob for Spark Gap - Microwave Fan

Primary  Coil
1/4 Copper Soft Tube
14.25" diameter coil
1" spacing from  Secondary
13 turns

Secondary Coil
Unknown turns
16" of  turns
19" Total Height

Top Load
Aluminum tape covered toroid made  from MDF and 4" Aluminum  duct
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