Re: Jonathon's 6" Coil (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 27 Jun 2007 21:42:40 -0400
From: Jonathon Reinhart <jonathon.reinhart@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Jonathon's 6" Coil (fwd)

Quick stats:    12/60 NST       .034uf MMC      120 BPS SRSG   (I
think....1800RPM, 4 electrodes...  1800/60=30*4=120).

I had a Terry Filter.  But for one reason or another, I believe one of the
MOVs shorted out, and was thus robbing a ton of power from my coil.  When I
added the 2nd half of my MMC, it took the spot where my terry filter was.
So I think I'll have to forget it, or find a new place for it....  I still
have the power resistors in place tho.

I think I may also build John Freau's phase adjuster.      and what do you
all think about my thoughts on my topload?

Jonathon


On 6/27/07, Tesla list <tesla@xxxxxxxxxx> wrote:
>
>
> ---------- Forwarded message ----------
> Date: Wed, 27 Jun 2007 18:04:30 EDT
> From: FutureT@xxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: Re: Jonathon's 6" Coil (fwd)
>
> In a message dated 6/27/2007 4:32:06 P.M. US Eastern Standard Time,
> tesla@xxxxxxxxxx writes:
>
> Jonathon,
> I find it odd that you can get  different results by adjusting the phase
> of your spark gap.  The  reason I say this is because my SRSG will ONLY
> fire,
> when it is perfectly  in phase (I have about 2 degrees of play, between a
> roaring gap (making a  musical tone somewhere between B and B flat), and
> an
> occasional random  crackle, take it out another 2 degrees and I have
> nothing).  What is  the approximate spacing of your gaps, mine are set
> kind
> of wide, at about  1/8 in (which is not really ideal).
> Scott,
>
> That is the key.  Your rotary gaps are set rather wide which is
> not  really
> good
> for the system. But if you have a Terry filter and run LTR, you can
> get  away
> with it.  Small NST systems should have a rotary gap spacing of
> only  about
> 1/16" or so.  This depends on how many series gaps are used, and
> the  voltage,
> etc.  If you're using tungsten then you have to be very careful of  course
> because
> it's brittle and can snap off if the electrodes hit each other.  This
> presents a
> danger to viewers unless a good safety shield is used around the gap.   I
> run
> the rotary gaps almost touching on my TT-42 coil.  I can do that  because
> the gaps are copper and steel and I round the ends of the copper.  So  if
> the
> electrodes hit (which they've done at times during testing), they
> just  glide
> past each other anyway, and nothing gets damaged.  It just makes
> a  ticking
> sound (which is how I know they're hitting.  The rounded electrode  ends
> might
> reduce the tendency to *prefire*, and reduces the mechanical dwell time.
> I actually leave the center of the end of the electrodes flat, but I round
> off the
> edges.  In any case, once the electrodes are set to run closely, they  a
> rather
> large phase range will work.  An advantage of your set up though is
> it  makes
> it easy to find the best spot, since there is only one spot that  works
> :)
>
> John
>
>
>
>
> Are you  using 120 or
> 240 BPS, (or are you not from the states, and using 100 or  200 BPS).  A
> tip
> of advice, to phase my gap, I built a test rig out  of a mason jar (beer
> bottle) cap, and a copper coil primary, with a junk  OBIT I had laying
> around
> (that way if something got fried, it didn't  matter a whole lot), just
> make
> sure you put some form of primary (and  ideally a secondary) in there so
> you
> don't fry your junk transformer  (don't use expensive capacitors, make
> one).
> If phasing is still  difficult to tell, widen your gaps until you set the
> motor is in it's  sweet spot (loudest, most steady noise), and then narrow
> the gaps back  down to decrease you gap losses.  In my test rig I have no
> safety  gaps.  What is your power level?  46 inches isn't too shabby!
> Good
> luck.
> Scott Bogard.
>
>
>
>
>
>
>
> ************************************** See what's free at
> http://www.aol.com.
>
>
>