Re: [TCML] 6 MOT stack?

["Peter Terren" <pterren@xxxxxxxxxxxx>]

This might be heresy but I have not used a ballast on any of my home coils 
from 4 MOT to twin PT and I make a lot of sparks from a simple domestic 
service although I do have variacs.
It helps to have an ammeter that is only 20A FSD I guess so you don't know 
what happens above that.....
I would stick with 4 MOT's. IMHO it's not making a super TC or getting the 
longest sparks that matters.  It's what you do after that that gets the 
recognition.

Peter www.tesladownunder.com

----- Original Message ----- 
From: "S&JY" <youngs@xxxxxxxxx>


> Jeremy,
> ............
> The archives are full of ballasting ideas, ranging from using a welder in
> series with your stack, to using a reel of #10 wire, to winding your own
> iron core inductor, to using more MOTs with the secondaries shorted.
> Personally I prefer not using any ballast and instead rectifying and
> filtering the output of a MOT stack, then using DC resonant charging with 
> a
> variable speed rotary spark gap.
> ..................
> Steve Y.
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of Jeremy Chan

> Greetings to all,
> ...... The bad thing is that I have no
> idea whatsoever how ballasting works. I am a Chemistry major in 
> university,
> and the coil construction was already stretching the bounds of my 
> electrical
> engineering experience. I do know that an unballasted MOT puts out about
> 3500W of power before burning out after 5 minutes, and a ballasted MOT 
> puts
> out about 1kW. But I need to know how to ballast a MOT stack for about 
> 5kW,
> whether capacitively or inductively. Programmes for calculating 
> circulating
> currents as well as trans/cap matches would be much appreciated.
> I considered a 4 MOT stack initially, but am concerned if it can handle 
> the
> full 5kW for prolonged periods, and the 8400V supplied seems low for a 5kW
> coil. Then again, with a 6 MOT stack I am worried that the MOTs at the
> extremities might not be able to handle the 6300V even with the stack
> centrally earthed. Does anyone have any experience or advice on these
> matters?
> Any advice would be much appreciated.Merci Beacoup,Jeremy

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