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Re: 60 vs. 30 ma

Subject:  Re: 60 vs. 30 ma
  Date:   Tue, 10 Jun 1997 10:58:57 Eastern Daylight Time
  From:   "Mad Coile{" <ts5815-at-devrycols.edu>
    To:   Tesla List <tesla-at-pupman-dot-com>


>Subject:  Re: 60 vs. 30 ma
>  Date:   Mon, 9 Jun 1997 18:43:31 -0400 (EDT)
>  From:   Esondrmn-at-aol-dot-com
>    To:  tesla-at-pupman-dot-com
>
>
>In a message dated 97-06-08 02:58:43 EDT, you write:
>
><< 
> Thanks to those who replied.  Maybe I could have asked my question more
> clearly, so I'll try again.
> 
> If I have a well-operating coil using a 12KV/30ma neon transformer, and
> I replace that transformer with a 12KV/60ma transformer:
> 
> 1.  To take best advantage of the 60ma, should I change the torroid
>size
> and/or change the primary tap location?  (assume the .005uF cap value
> won't change)
> 
> I think I read that by using a larger torroid, a smaller cap could be
> used.  Therefore, if I use a 60ma transformer (which would normally
>call
> for about a .01 cap), I could get away with using the original .005 cap
> by using a larger torroid.  Is that correct? 
> 
> 2. After changing the torroid size and/or primary tap, what increase in
> spark length should I expect as a result of moving up to 60ma?
> 
> 3.  If I changed only the primary tap location (if that would help) and
> did NOT change the torroid size, what increase in spark length should I
> expect as a result of moving up to 60ma?
> 
> Thanks again,
> 
> Tedd
>  >>
>Tedd,
>
>If your system is currently operating and in tune, changing from a 30 ma
>transformer to a 60 ma transformer will require no changes to your
>system.
> Based on my experience, you should see about a 50% increase in
>performance.
> Say from 12" discharges to 18" or 20".  It probably won't double the
>performance.
>

Are you certain? In my Tesla Coil the primary capacitor is 
directly across the high voltage leads of the xformer. For
most cases, in order to draw the rated current (ie 60mA) you
need a capacitance value so that the capacitive reactance (Xc)
is equal to your voltage (ie 12000v) divided by max current
output (ie 60mA). Or Xc=12000/.06
If your capacitor is matched for a certain voltage at a 
certain current output then that will change when you use a
different voltage or different current. For example, if you
had a capacitor matched for 12kV and 30mA and you put a 12kV
60mA transformer across it, it would still only draw 30mA even
though the transformer can put out up to 60mA. This is only 
general though, in a Tesla Coil system there are ohter things
like spark gaps that can draw the extra power. Putting a
higher current rated transformer in the circuit will increase
the output, but most likely not as much as if the capacitor
was matched. There are other things like peak amps, etc. that
also increase with an increase in capacitance.

Hope this helps,
T.Stewart