Re: [TCML] VTTC Curent Draw

["Phillip Slawinski" <pslawinski@xxxxxxxxx>]

I did say in my original post that I'm using 28T of 8AWG.

I think I may have found the answer to my problem, though it's not one I
really like.  My MOTs are not a matched pair, so perhaps this is causing the
issue?  I tried running the  coil with just one transformer.  I'm able to
get 80-90% of the spark length I'm getting with two transformers in series.
Furthermore, I did not go above 20A until I passed 120v on the variac.

When I run with two transformers I pull more than double the current before
I get to 120V.  Does having a matched pair of transformers really matter
that much?

On Wed, Sep 24, 2008 at 2:45 PM, James <mustang3@xxxxxxx> wrote:

> Hi Philip, You didn't say how many turns of primary your running. I
> usually run 30-33 turns for the primary for my toob coils. I haven't
> found the tickler coil to be very critical. You need to turn the toob
> off; -hard-. Minor tuning here didn't make much difference on my VTTC.
> Generally, we set the current through the tube by adjusting the GL
> resistor. I think I use about 3K ohms for the GL resistor.
>
> Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Garry neeley
> Sent: Wednesday, September 24, 2008 10:21 AM
> To: Tesla Coil Mailing List
> Subject: RE: [TCML] VTTC Curent Draw
>
> Philip,
>     That doesnt sound right.  My 833c coil isnt exactly in tune yet but
> Im getting around 20 inches and my coil draws around 15 amps at 100% on
> the variac.  I'm only using 1 mot at the moment.
> Garry Neeley
>
> -----Original Message-----
> From: Phillip Slawinski <pslawinski@xxxxxxxxx>
> Sent: Wednesday, September 24, 2008 9:12 AM
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Subject: [TCML] VTTC Curent Draw
>
> I've been tinkering with my 833C for several weeks now.  Unfortunately
> no matter what I do the thing seems to want to pull 50A at full voltage.
> I'm getting some pretty nice performance out of it now [20-24"] in
> continuous mode @ 100V/50A.  I know the coil is in tune, I've tried
> removing
> turns, and I've tried adding a little capacitance and both of those
> result
> in shorter raspy sparks.  I don't think the grid is the problem.  I've
> tried
> both CW wound grid coils and CCW wound grid coils.  All my grid coils
> have
> been 22 turns.  My primary and secondary are both wound CW.
>
> I'm using two large (nearly identical) series wired MOTs which go
> through a doubler consisting
> of a rectifier and 2nF 13kV filter cap.  My tank cap is a 12kV 2nF mica
> transmitting cap.  My grid resistor is 10K, and I have a 2nF doorknob in
> parallel with that.  My primary is 28 turns of 8AWG.I s  My secondary is
> 17" of
> 26 AWG.
>
> What could be causing this current draw?  Is  the amount of current
> I'm drawing in line with the spark output I'm getting?
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