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Re: A 1/4 wave Tesla coil
Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-uswest-dot-net>" <m.j.watts-at-massey.ac.nz>
On 7 Feb 01, at 17:27, Tesla list wrote:
> Original poster: "B2 by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> > Performance:
> > Operating frequency: 280khz
> > Spark length with no breakout tab: multiple arcs 48"(+)
> > Spark length with breakout tab: single arcs 60"(+), very, very thick
> > Interesting note: With no Cop, arcs are close to 42" from top
> > terminal, but coil is obviously poorly tuned and much corona around
> > top turns of secondary.
> Hi Skip(1),
> I've seen John Freau's coil make sparks about this long with about
> as much energy (HTSTWMOE(2)). It would be an informative experiment
> to halve the primary capacitance and add a few more turns to the
> primary to bring it back into tune (start with it undercoupled). John
> Freau used #12 PVC insulated wire (machine tool wire?) for his primary
> with about 34 (?) turns. After seeing this I will never build a
> subpig system with copper tubing.
Are the physical secondary sizes comparable (i.e. capacitances)? That
result could be explained by a difference in output voltage could it