Re: 60 vs. 30 ma

Subject:  Re: 60 vs. 30 ma
  Date:   Wed, 4 Jun 1997 04:49:13 -0700 (PDT)
  From:   gweaver <gweaver-at-earthlink-dot-net>
    To:   Tesla List <tesla-at-pupman-dot-com>

At 12:21 AM 6/4/97 -0500, you wrote:
>Subject:   60 vs. 30 ma
>  Date:    Mon, 02 Jun 1997 18:39:14 -0500
>  From:    Tedd Payne <tpayne-at-netnitco-dot-net>
>    To:    Tesla List <tesla-at-pupman-dot-com>
>Here's another "what if".  Suppose I have a well-designed Tesla coil
>using a 12KV/30ma neon transformer, .005 uF cap, appropriate torroid,
>RQ-style gaps, primary with more than enough turns, and the coil
>produces an 18" discharge when optimally tuned.
>Now suppose I replace the 12KV/30ma transformer with a 12KV/60ma unit. 
>I'm wondering how much the performance will be improved by the higher
>current transformer combined with little or no other changes.  My

On a small Tesla Coil if you double your input power the output appears
double also.  This is a non linear increase.  If your getting 12" sparks
from  500 watts and increase to 1000 watts your output will increase to
about 20" to 24" which is about double.  If your getting 24" sparks from
1000 watts and increase to 5000 watts you would expect to get 24" x 5 =
sparks but your output will be much less, maybe 7' or 8'.

>1. How likely is it that any part of the whole system would be damaged
>by the higher current?

If you change nothing but the power supply you may get arc over between
primary and secondary coils.  This may burn a spot on your secondary and
high voltage feed back into the primary can go into the transformer and
it. Chokes on the transformer help to protect your transformers from
voltage feed back.  Safety gaps are good protection also.

>2. What increase in discharge length could I expect by changing only the
>primary tap location?

Once you find resonance frequency your discharge length will be the best
can expect for the system you are using.  If your Tesla Coil has a wide
width moving the tap a few inches won't make much difference.  If your
Coil has a narrow band width moving the tap a few inches can make a big

>3. What increase in discharge length could I expect by changing the
>primary tap location in conjuction with using a larger torroid?

If you have your primary tapped at the correct location using a small
then change it to a large toroid your primary will have to be retapped
find the new resonance frequency.  After you find the new resonance
frequency your system will be performing best once again.  The larger
will usually give longer and hotter discharge sparks.