Re: Large MOT vs. Small MOT

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Dan Williams <coilerdude@xxxxxxxxx>

Thank you all for the food for thought.
You have provided a very clear answer to my question and 
possibilities for improvement, exactly what I was looking for.

Tesla list <tesla@xxxxxxxxxx> wrote:
Original poster: FutureT@xxxxxxx

In a message dated 3/8/07 1:49:15 AM Eastern Standard Time,
tesla@xxxxxxxxxx writes:

> >Original poster: Dan Williams
> >
> >I am in the process of buttoning up my 813 VTTC (can be seen at
> >www.coilerdude.20m.com). Tonight I tried a larger unshunted MOT in
> >place of the small shunted one I was using.
> >
> >NO Difference Whatsoever.
> >
> >Spark length stayed the same, intensity stayed the same.
> >
> >This dosn't make allot of sense to me.
> >Someone shed some light? Maybe suggest what else I might try to
> >increase spark length past my current threshold of 12-14"?
> >
> >Have added a few more taps and tried tuning, max seems to be 12-14"
> >at this point. I know for a fact that this tube is capable of much more.
> >
> >
> >Dan


Dan,

Your coil is "set up" to draw only that particular amount of
current. Are you using the level shifter double circuit with the
uWave oven cap and diode? If not, then the spark length will
be limited to about 12" or so. If you have the doubler, then
it may be a matter of tuning, or grid drive or grid resistor value,
or number of primary turns, etc. Another possibility is that
the tube is weak and has low emission unless you know the
tube has full output capability. So these are some things to
consider.

John


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