RE: Large MOT vs. Small MOT

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "S&JY" <youngs@xxxxxxxxx>

Dan,

In simple terms, your VTTC presents a certain load to the transformer.
Think of the load as a resistor, although it is not likely to be linear.

If your two transformers provide the same output voltage, then your VTTC
"load" will draw the same current from each, no matter how large your MOT
is. It just simple Ohm's law:  I = E/R, where R is the load your VTTC
represents.  Or power = E*E/R.

Only by going to a higher voltage transformer will you draw more power with
correspondingly longer streamers.  Of course, the limit is when the voltage
is high enough to cause your 813 plate to melt, or to cause a flash-over
inside your 813.  Either way, your 813 will be toast.

Other experts can advise you on varying your grid resistor, feedback
coupling, etc. to produce stronger oscillations (and longer streamers) for a
given plate voltage.
--Steve Y.

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Wednesday, March 07, 2007 8:51 PM
To: tesla@xxxxxxxxxx
Subject: Large MOT vs. Small MOT

Original poster: Dan Williams <coilerdude@xxxxxxxxx>

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


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