Re: yet another cap for MMCs

["Finn Hammer" <f-hammer-at-post5.tele.dk> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Tesla list wrote:
> 
> Original poster: Terry Fritz <twftesla-at-uswest-dot-net>
> 
> Hi Jason,
> 
Snip....
> 
> For the record, an 8 string by 4 in series array of 0.056 Panasonic caps
> would run at +5C and cost about $45.  So it is all the same in a way...  8
> strings of these caps will handle 24 amps.  "I" would probably go for a 6x3
> EMMC :-))  That's only $26 for the current (18 amps) and voltage (2200V
> each cap, kinda high :-)) that should work fine.  But I like to push MMCs
> hard...
> 
> Cheers,
> 
>         Terry

In my small coils, 4"16", I drive them with 2 MOT`s in series, and use
56 nF/1600 VDC Phillips 376 caps.

2 caps =112 nF lasts less than a minute ---> overvolted mostly.
A 4 strings with 2 series caps =112 nF lasts about 15 minutes.
My 6 trings with 3 caps in series = 112 nF is still in great shape after
some hours operation. (and will probably last forever.
My 8 strings with 4 caps in series =112 nF is in myseum duty, where it
has done several hours of service without a snitch.

I strongly advise any coiler to do these performance tests, to get a
real feeling for the durability of these caps. You`l feel so much more
secure about your present cap, after you have deliberately blown a
cheaper configuration, and taken the caps apart and seen that they all
blow at the innermost 1/2 meter of the foils, due to heat buildup in
there.

Cheers, Finn Hammer