Re: [TCML] upgraded NPT to 15/60

[Gary Lau <glau1024@xxxxxxxxx>]

Hi Joe,

NPT=NST??

A couple things I want to mention.  Your toroid looks kind of small for a
15/60 powered system.  My 15/60 coil uses a 7"x30" toroid, and every
increase in size resulted in longer sparks.  The down side is that while the
sparks got longer, they also got less frantic and bright, so that's a
tradeoff.

You also mentioned using an SRSG.  It's vital to realize that you just can't
swap out a static gap with an SRSG.  Unless you also increase the cap uF
when going to an SRSG, you'll overvolt things considerably, or if you have
properly set safety gaps (a MUST-HAVE with any rotary gap), they'll fire
constantly.

With my 15/60, I found the optimal SRSG cap value to be 0.04uF (at 60 Hz).
This is larger than most folks use with a 15/60 & SRSG, but works well for
me.

Of course if you change the cap size with the gap type, you'll also need to
change the primary or secondary or topload to keep things tuned, so it's not
possible to change only the gap and see if performance improves.  It really
involves a complete system makeover.  But it's a good time to consider
increasing primary and secondary inductance and topload size - all
beneficial things.

Regards, Gary Lau
MA, USA

On Sat, Jun 12, 2010 at 6:39 PM, Joe Mastroianni <joe@xxxxxxxxxxxxxx> wrote:

> Same coil I showed last time.
> Added another bank of CDE 942C20K15 caps to bring total to 36.   Two
> parallel strings of 18.
> Upgraded the NPT to a 15/60.
> Spark activity is much more significant.  Where before I would only have
> sparks at the brass breakout rod, now they're everywhere.
> I think I'll try shining up the toroid to see if that changes the
> characteristics.  I'll also do a night shot for contrast.  The streamers are
> actually hitting the strike ring now, which they didn't before.
>
> Tuning had to change from the 15th turn of the 1/4" flat coil of
> refrigeration tubing to between the 11th and 12th.  I didn't do fine tuning
> yet.
>
> <http://yfrog.com/mjimg0083z>
>
> I have some components for the synch rotary SG, and other showing up this
> coming week.   We'll see how that works.
>
> Cheers,
>
> Joe_______________________________________________
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> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
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