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Re: Why does top capacitance work?
Another angle on this one....
> Subscriber: lod-at-pacbell-dot-net Sat Feb 15 14:25:24 1997
> Date: Thu, 13 Feb 1997 22:26:05 -0800
> From: Greg Leyh <lod-at-pacbell-dot-net>
> To: tesla-at-pupman-dot-com
> Subject: Re: Why does top capacitance work?
>
> Bert wrote:
>
> > Steve,
> >
> > It turns out that adding capacitance to the top actually reduces the
> > maximum output voltage that the coil can generate! However, adding a
> > toroid-shaped top-load can prevent the secondary from starting to
> > break-out with corona/streamers until a higher voltage is reached. This
> [snip]
>
> > -- Bert H --
>
> Bert,
>
> Doesn't this apply only to the very first gap firing, when the power is
> first applied? After that, the first streamer would adversely compromise
> the holdoff voltage of the toroid, acting electrically as a long needle
> that projects from the toroid. The subsequent gap firings appear to only
> build upon the initial streamer, unless the gap rate is so low that the
> ions start to re-combine between gap firings. This results in a large
> number of small streamers.
>
> I am still mystified as to why a large toroid makes a difference. My
> favorite explanation is that the addition of a huge toroid forces the
> operator of the TC to add capacitance to the primary, for tuning purposes.
> More capacitance increases the thruput power, which is always better.
>
>
> -GL
Isn't it common practice to increase primary inductance rather than
changing caps to compensate in many cases? That should up primary Q
which would also show a benefit.
Malcolm