Re: Garry's MMC cap failure explained.

["Tesla list" <tesla-at-xxxxxxxxxx>]

Original poster: "Metlicka Marc" <mystuffs-at-orwell-dot-net> 

terry,
does the construction of garry's caps use that "compressed aluminum powder"
looking stuff for the foil end connections? the reason i ask is that i had some
propylene caps that heated on one end in operation also, after a few burnt,
i tore
them apart and it seemed this powdery stuff had some kind of plastic
blended into
it, (maybe a binder?) this powder end cap actually had nonconductive spots
in it
that my megger wouldn't ring threw. i thought that even though i used a sink on
the leads, i overheated the "powdery cappy thingy" and melted the "binder"? if
this could be what is going on then maybe all the current is going through
a very
small area on the end cap?
i threw all of them out and i don't remember the make, but i'll dig in my junk
boxes if you think this is feasible, might still be one lying around.
just a thought.
marc

Tesla list wrote:

> Original poster: Terry Fritz <twftesla-at-uswest-dot-net>
>
> Stan,
>
> We are thinking this was either a bad batch or something else is wrong.  I
> did notice that one seemed to heat on just one side??  Garry had the leads
> bent pretty close to the case.  I wonder if the end connections were
> damaged by sever lead bending?  I'll do more tests...
>
> Cheers,
>
>         Terry
>
> >snip