RE: I need advice on sync spark gap

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

Original poster: "Lau, Gary" <gary.lau-at-hp-dot-com> 

When running a 15/60 on a static gap, a .01uF cap is OK.  But when using
a sync gap, one MUST use a much larger cap, or else the charging voltage
will be excessive.  That's why your MOV's smoked.

Gary Lau
MA, USA

 > 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
 >