Re: Small coil questions?

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

Original poster: "RIAA/MPAA's Worst Nightmare" <mike.marcum-at-zoomtown-dot-com> 

if it works until you add tank capacitance you might have went out of the
tuning range of the primary (less than a turn, generally bad since that's
little surge impedance which leads to higher gap losses). I would suggest
either adding a bigger topload with a breakout point (easiest and what I'd
do), rewinding the primary smaller with more turns and put it inside the
secondary (more of a pain, especially with tuning, and overcoupling is
harder to control), or rewind the secondary with more turns (time
consuming).

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, December 20, 2003 10:31 AM
Subject: Re: Small coil questions?


 > Original poster: "Kreso" <kreso.bukvic-at-kc.htnet.hr>
 >
 > Affcorse i tried tunning it just wont create good spark. At 4.7 kv 67 ma i
 > should get atleast 50 cm sparks. But it aint gonna happen im skepitacal at
 > your 14 inches Dan, also you guys brag yourself in the net but in live it
is
 > really diffrent.
 >
 >
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Saturday, December 20, 2003 2:30 AM
 > Subject: Re: Small coil questions?
 >
 >
 >  > Original poster: dhmccauley-at-spacecatlighting-dot-com
 >  >
 >  > Your coil is not in tune.  As the primary capacitor increases, the
amount
 > of
 >  > inductance (or number of turns) required for resonance at your
operating
 >  > frequency
 >  > will decrease.  You need to change the primary tap when changing
capacitor
 >  > sizes.
 >  >
 >  > Dan
 >  >
 >  >
 >  >  > Well i finished the coil today. I overdrived the nst to 67 mA. I
tried
 >  > using
 >  >  > 33 nf mmc i can tune coil and get 8 cm sparks. When i tried 60 nf i
 > cannot
 >  >  > tune coil 2 cm arcs, then i tried LTR 90 nf mmc nothing only mm or
so
 >  > spark?
 >  >  > What is going on?
 >  >  >
 >
 >