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Re: [TCML] VTTC-tuning. John got me started ;-)
I haven't heard of specific frequency when bushy sparks turn into corky ones.
I think I saw 100 kHz VTTC with corky spark and 500 khz with bushy sparks.
More factors must be the cause.
Dex
--- rwsmith@xxxxxxxxxxxxxx wrote:
From: "Roger Smith" <rwsmith@xxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Cc:
Subject: Re: [TCML] VTTC-tuning. John got me started ;-)
Date: Wed, 1 Apr 2009 07:42:53 -0500
There is a VTTC on YouTube that is pretty big (
http://www.youtube.com/watch?v=7Ky4a9KPlVY ) . It uses a 3CX3000 Tube and
runs at a fairly low frequency producing bushy looking sparks. It seems
that most people prefer the sword like sparks these days and as I understand
it, that requires the coil to resonate above 300 KHz.
Roger
----- Original Message -----
From: "Dr.Hankenstein" <dr.hankenstein@xxxxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Tuesday, March 31, 2009 11:32 PM
Subject: RE: [TCML] VTTC-tuning. John got me started ;-)
> Not sure.
>
> I heard of a man in Canada about ten years ago who made a 15kw coil
> called the "Coronatron"...built from a cannibalized transmitting
> amplifier. Unfortunately, I don't know much else about this.
>
> The biggest one I know of presently is Dr. Spark's "Quadzilla"; a 4 x
> 833C coil with an 8kw power supply. Chris brought his coil to the
> Arizona Teslathon a couple of weeks ago. What I can say, is that his
> coil is awesome to say the least. In staccato mode it actually sounds
> like a "Huey" Helicopter!
>
> Regards,
> Hank
>
>
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Dex Dexter
> Sent: Tuesday, March 31, 2009 3:41 AM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] VTTC-tuning. John got me started ;-)
>
> Hi John Freau,
> What is the biggest (the most powerfull) VTTC build that you know of?
> What was (is) its' input power ,spark output,and aproximate output
> voltage?
>
> Thanks,
>
> Dex
>
> --- futuret@xxxxxxx wrote:
>
> From: futuret@xxxxxxx
> To: tesla@xxxxxxxxxx
> Cc:
> Subject: Re: [TCML] VTTC-tuning. John got me started ;-)
> Date: Mon, 30 Mar 2009 19:03:50 -0400
>
> Chistoph,
>
> Generally speaking, if the spark length stops increasing at a
> certain point as you turn up the variac, this means you need
> to lower the tank frequency by increasing the tank C or
> using more primary turns. Probably best to use more primary
> turns.
>
> If you can get rid of the multiple streamers that will help
> the spark length. The multiple streamers could be the
> cause of the shorter sparks, instead of what I said in the
> paragraph above. But regarding tuning, the primary tank
> often has to be considerably lower in frequency than the
> secondary frequency, from a calculated point of view. This
> takes care of spark loading effects, and frequency splitting
> issues. Tuning is best done at full power. You can do this
> by trial and error my moving the tap point on the primary
> and turning up the power.
>
> You can try using a taller break-out point, that might help
> in getting a single streamer. Tuning can be a factor there maybe,
> and also the other fcators I mention above.
>
> Various factors such as the degree of grid feedback, grid
> resistance, tuning, main coupling, etc can affect the look
> of the spark, and make them swordlike or fuzzy, etc. It can
> take awhile to really optimize a VTTC.
>
> You can probably set the staccato board without a scope
> by listening to the sound of the sparks. When it's set up right,
> the pulsing will sound "solid".
>
> Is your main power transformer a powerful one? That's important
> also for tube coils.
>
> Cheers,
> John
> -
>
>
> -----Original Message-----
> From: Christoph Bohr <cb@xxxxxxxxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Mon, 30 Mar 2009 3:55 pm
> Subject: [TCML] VTTC-tuning. John got me started ;-)
>
>
>
> Hello again.
>
> As you might have followed, I was pretty happy with my VTTC's
> output, until "someone" pointed out there was plenty of room for
> optomization ;-) I'm just kidding...
>
> One thing on the history of this project. During a first higher power
> run
> of the prototype I had a sparkling effekt inside the tube, presumptively
> at the cathode. I nedded a second to turn the power off and since then,
> the fillament is notably brigher in this spot when switching the
> filament
> supply on. With soft-start this is less visible and once the fimament
> is on,
> I cant see any difference. However, the tube still lives, but I don't
> want to
> break
> it.
> Currently there are 2 major question troubling me:
>
> 1:
> One thing I noticed is, that when I increase the pulse rate or power,
> there
> is a point at ca 70% from where on I get multiple streamers, pretty
> bushy and
> white hot, but the lengts does not increase from this point on.
> I sould be around calculated 250KHz, which seems to be problematic from
> what
> I have read. Without toroid I could get to 330KHz... would this be
> worthwhile
> trying?
> Sounds dumb, but the toriod is glued to the secondary ( OK, even dumber
> )
> I could of course detatch it, but I'd like to ask first if this makes
> any sense
> at
> all.
> My idea was, that if there was a single streamer instead of multiple,
> it might
> be
> longer without having to push the tube any harder.
>
> 2.: I read I needed a scope to setup staccato. I just made a PCB,
> soldered
> everything
> together, plugged it in, and it worked... at least I think. I have a
> scope, but
> no
> idea
> what I should set up what can't be done with the controlls available on
> the
> fly...
>
> 3.: coupling. currently the bottom turn of L1 and L2 are aproximately
> on the
> same
> hight.
> The feeback winding starts 1cm blow the primary and extends 15 turns
> until 4,5cm
> below. Does this sound reasonable? I know, its impossible to give exact
> numbers
> her,
> I just want to see if someone says something is completely wrong....
>
> Enough for now. For extensive tuning I should move over to my parents
> house.
> I am living in an appartment which might be asking for trouble with my
> neighbours
> or the authorities.
>
> best regards
>
> Christoph Bohr
>
>
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