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Re: [TCML] Odd VTTC Streamer Behavior
> Actually that all looks pretty nice from what I can see in the
> photo. I don't know if that loop of wire hanging would
> make very much difference. Are you saying the loop was
> part of the primary then it fell down?
I felt I had too many primary turns so I unwound it tested without cutting
the wire (for obvious reasons) It's laying on the side to decouple it from
> When I spoke of hte size of the doubler cap, I wasn't
> refering to the reduction in spark length you saw.
> I was refering to the general problems you had at
> high power with spark splitting.
> I see too that you're using the high mounted grid
> coil such as Cameron used. I also see that there seems
> to be quite a few turns on teh primary. Either that
> or it's rather thick wire. How many primary turns are
> you using, and how many grid coil turns?
Actually it's both in this case. 8 AWG ~25 turns for the primary. 24 AWG
22 Turns for the grid coil.
> What happens
> if you use a much lower position for the grid coil?
Nasty things; the coil starts getting very power hungry, and the sparks
start making bad sounds. The thud sounds somewhat screechy, or it makes a
> If you gradually lower the grid coil, does the spark
> length change gradually?
Yes, and if I go below a certain point the sound changes, and the coil
> Or does the spark vary
> up and down depending on height? For example
> if you lower the grid coil about 2" does it have much
There seems to be a point on the form where performance drops, and the coil
starts acting up if I go below that point. There is also a point where the
grid is too far away and the performance drops. I'll do some more extensive
testing this evening.
> I'm thinking maybe you're taking advantage
> of various phase conditions by using the high grid coil.
> the high grid coil might be improving the sparks, making
> them generally more sword-like.
I received my filament transformer yesterday, and installed it today. This
is interesting because when I plugged it in and tested the coil for the
first time the performance was terrible. I could not get the coil above 50V
without the sparks making a popping sound [which sounds really bad]. I
thought the filament looked a little bright, and sure enough the transformer
was running at 10.3V. To remedy the situation I hooked the transformer up
to a variac and set it so that it was exactly 10V with the load of the lamp
applied. When I started the coil back up it ran much better. Better in
fact, than the coil was running with my home-made filament transformer. It
was too bright for me to see what the sparks were doing, I could just hear
that the sparks were hitting the target more often than before. That said,
I highly doubt the home-made filament transformer was the only cause of my
problems. I haven't changed this filament transformer since I wound it, so
it was the same when I was pushing out 34" sparks.
It's also interesting to note that when I was running the coil with the new
filament transformer installed I noticed that the sparks had had little
streamers coming off the leader at 90 degree angles. This is something I
remember seeing when the coil was performing well and throwing out 34" arcs.
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