Re: I need advice on sync spark gap -Thanks for your help

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Robert Hanford" <pomnept-at-comcast-dot-net> 

I wanted to thank the list for help with my SRSG. I used a much larger cap,
and now my little four inch coil spits out streamers that are way too big
for my basement ;^ )
Best regards and happy Thanksgiving,
Robert Hanford
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, November 08, 2004 6:20 PM
Subject: Re: I need advice on sync spark gap


 > Original poster: FutureT-at-aol-dot-com
 >
 > In a message dated 11/8/04 10:18:02 AM Eastern Standard Time,
 > tesla-at-pupman-dot-com writes:
 >
 >
 > >Original poster: "Robert Hanford" <pomnept-at-comcast-dot-net>
 > >
 > >Hi everybody, I have a problem that I'm sure is a no- brainer for most
 > >experienced coilers.
 > >My coil has been working fine with a vacuum gap, so I thought I would
 > >experiment with a SRSG. Worked well at low power, but could not find the
 > >"sweet spot" at full power, even with quite a bit of monkeying around. I
 > >pulled the safety gap out a "little" too much, then it worked real well
for
 > >a few seconds, then my MOVs went kaput.I am using a Freau phase
controller,
 > >.011 MMC cap, 15k/60ma NST, and of course a SRSG. And a 4.5 inch
secondary.
 > >Well, the damage was done, so it was time to quit. I haven't checked my
NST
 > >yet.
 > >I hope somebody might give me a few ideas about possible errors- what was
 > >frustrating is that it was working so well at lower power. Do I need a
 > >larger cap?
 > >As always, any help is most appreciated.
 > >Robert Hanford
 > >
 >
 >
 > Robert,
 >
 > A larger capacitor would most likely be helpful in keeping
 > the peak voltages down.  For a 15/60 NST, a cap value of about
 > 0.025uf to 0.035uf or so should be good.  Your present cap is basically
 > a resonant value which will give a rather high voltage on the
 > capacitor.  I think Gary Lau now uses a 0.04uf cap on his
 > 15/60 coil, and he has found this to give the best results on
 > his coil.  At Wingate's Teslathon, he got about 72" + sparks.
 >
 > Also, the phase setting generally needs to be changed as
 > the power level in increased vs. the setting for a lower power.
 > I usually just determine the best setting for full power and
 > keep the phase set at that position.
 >
 > Cheers,
 > John
 >
 >