Re: MMCs for sale

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jason Johnson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <hvjjohnson13-at-hotmail-dot-com>

The reason that NSTs have a problem with async gaps, is because your gap is
not locked into the frequency of the mains and if your gap misses a firing
because an electrode wasn't presented at the right time along the sine wave
the voltage skyrockets, and you eventually end up with a dead transfomer or
cap. This is less of a problem if you use properly set safety gaps and leave
them where you set them. Pole pigs get the same beating but since their
built like tanks they can take their beating and just shrug it off (usually,
there have been a few pigs killed in tesla duty, but I believe they were hit
by a secondary discharge). MOTs really are such low voltage that even if
they have a overvoltage situation its not that much of a problem, especially
if they are in an oil bath. The voltage may only end up at several thousand
volts, where as with most NSTs they are already at the same voltage levels
to start with. We'll find out tonight though, I just finished am async
rotary for my MOT coil the other day :-) The reason that caps can have a
problem with it is because people usually run high BPS with async gaps, and
this is hard on almost all caps (design a MMC in Terry's MMC calc, and then
double or triple the BPS and look at the life expectancies, you'll see what
I mean!)

Jason Johnson

> I've read that NST's will die with async rotary gaps, but MMC's?  Why
> would MMC's have more of a problem with async rotary than other caps
> would?
>
> And, BTW - why do NST's have a problem with it, as opposed to other
> transformers (pole pigs, MOTs?).
>
> -  Bill V.
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