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Re: [TCML] MOT stack replaced with PT, performance gone

Hi Ted, Scott,

The PT is 100:6000V, so with a slightly overvolted input, voltage output
should be about the same as with 4 MOT's.
To get a higher power throughput I've doubled the flying electrodes, going
from 200 to 400BPS. Did a run, still nothing..

Leaving the theoretical approach for what it was, I tuned the primary tap
inward. And here you go, the coil came back to life. With the MOT's, the
sweet spot was between 5,5 and 6 turns. It started sparking again when I
putting the tap a tad before the 5th turn. The sweet spot is now between 4
2/3  and  4 5/6 turns.

I am pleased with the result, but I don't understand what is going on in
reference to my calculation sheet. Please bear in mind my knowledge in this
matter is limited, but I've coped with the steep learning curve so far.
Since the secondary and topload are unchanged, Fres. should remain the
On the primary side, Cp is unchanged. The primary 'L part' in the LC
calculation has just become more complex, at least for me I guess.


2012/7/13 Tesla <tesla@xxxxxxxxxxxxxxx>

> Greetings
> An aspect I'd consider is resonance with the leakage inductance and the
> primary cap in the MOT system.  Magnetically Shunted MOT's will have much
> higher leakage inductance ( I think at least 6Hy per MOT)  than the PT
> leading to significantly different dynamic charging of Cp with the PT I
> think
> Rgds
> Ted in NZ
> -----Original Message----- From: SusaX2 X2
> Sent: Thursday, July 12, 2012 1:56 PM
> To: Tesla Coil Mailing List
> Subject: [TCML] MOT stack replaced with PT, performance gone
> Hi,
> recently my 4MOT-stack died and I replaced it with a PT.
> I expected quite a performance gain, since it puts out twice the power of
> the 4 MOT's.
> But the completely opposite happened,
> from streamers well over 1 meter to feeble 10cm sparks.
> I also noticed the 200BPS SRSG fires very week, despite adjusting phasing
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