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Re: [TCML] VTTC-tuning. John got me started ;-)



Hello Roger, all.

> 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.
I read that, too, on Steves Website, but he himself states that he only
believes there could be a connection, there is no proof, hovever.
Or are there any hard facts concerning this point?

regards

Christoph Bohr


>
> 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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