[TCML] MOT shunts (was Capacitor Configuration)
danniken at comcast.net
Sat Mar 19 13:40:27 MST 2011
John S. wrote:
> I destroyed 8 MOTs before I realized the
> secret....take the shunts out and make a good ballast. Removing the
> shunts made the MOTs run much cooler. In fact, with them in, the oil
> would be hot to the touch just after a few quick minute long runs. I
> think that the heat contributed to their failure. Now I can run the
> coil much longer and the oil never gets warmer than ambient temp. I
> haven't lost a transformer since.
Interesting observations, John. MOT shunts are one area where nobody really
seems to be in agreement, at least from I have noticed over the last decade
or so on the list. I have read some suggesting to leave them in, some
suggesting to take them out, and some saying that it really doesn't matter.
I do know that they are not anywhere near as significant as in an NST, but
considering the intended application of a MOT as only running in a half-wave
double, they don't need to be.
What voltage were you running your MOTs at initially, when they were burning
out? Do you think that perhaps running them with an external ballast had
more of an effect than removing the shunts (ie, what was the voltage/current
at each MOT before and after ballasting)?
It would be nice to nail down the issue of MOT shunts once and for all and
determine the best choice when using them in a TC supply. I've got a MOT
I'll run some experiments with and publish the data when I am done.
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