The lower toroid has to be close to the top of the secondary to
prevent breakout from the top windings. Therefore the space
has to be between the toroids if you want to do any toroid
raising. Generally it works a lot better with the small
toroid below the large one. If you put the small toroid
on top, the sparks will likely still emit from the large
toroid. It's possible that this arrangement might
give the sparks an upward bias, I don't remember.
The reason you
often see the toroids touching is because coilers
often just rest one toroid on top of the other.
However the spaced toroid method works
very well. If the top toroid is too heavy,
the 1/4 20 threaded rod might get a little
wobbly, but will likely be OK. Some folks
put a pvc or metal cylinder of some sort
between the two toroids. There are various
approaches that can be used. I don't know
how high the upper toroid can be raised
before other problems might develop?
(I never tried raising it more than a few
inches). Actually Richard Hull of the
TCBOR had a magnifier setup in which
the upper toroid was maybe a foot higher
than the lower one, and there was a cone-
like metal piece connecting the two,
and that system worked well.
Christmas Greetings to All,
John
-----Original Message-----
From: John Cooper <wt5y@xxxxxxxxx>
To: futuret <futuret@xxxxxxx>; tesla <tesla@xxxxxxxxxx>
Sent: Tue, Dec 23, 2014 7:54 pm
Subject: Re: [TCML] New nst/primary strikes
Yeah at first when I tried a 6" dryer duct I wouldnt get any sparks without a breakout point. I'm getting them now though. After adding the nst my sweet spot is now roughly 3 turns in on my primary coil. I also doubled my mmc by adding 16 caps in parrallel with the original 16.
On the toroid I actually had them squashed together. Everyone I've seen on various sites I've never noticed any gaps when using double toroids. I have 6ft of 1/4 20 allthread so I can try that. Is it always better to have the smaller topload on bottom? I know if I raise them too high I will get small breakouts from the top windings on secondary.
Thanks for all the feedback.
John cooper
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