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Re: [TCML] GE Pulse Cap

Hi Bob,

Yes, I seem to recall seeing that particular GE pulse cap on eBay before. It is probably the older style paper and oil dielectric system, hence its relatively large physical size for its voltage/capacitance rating. It would probably work fine for a mid-sized coil.

Actually, I’ve heard that the Maxwell 31393 capacitor, unlike most of its 31xxx series counterparts, actually has a several hundred pps rating instead of only 1 pps.
OTOH, I have had much success even using Maxwell pulse caps that are only rated at 1 pps, assuming that their voltage rating is sufficient. Remember, pulse capacitor shot lifespan goes up more than exponentially with any descent in their operational voltage from their rated voltage. So if you have a 75 or 100 kV rated pulse cap that you are only running at only 15 kV (about 22 kV peak), then your capacitor’s shot lifespan will likely be many, many times what it’s rated shot life is for its rated voltage.


Sent from my iPhone

> On Dec 27, 2018, at 1:50 PM, Robert Arenella <rja12@xxxxxxxxxxx> wrote:
> Hi all,
>           With all this talk about pulse caps, I have a question.  I was recently given a GE pulse cap, Model 17L 9PH. Rated at .0438 uF @ 50 KVDC, 180 PPS. This thing is big, 28" H x 8" W x 6" D and weighs in at 49 lbs.  Do you guys think this cap would do well in a TC environment? Hate to build a coil around a certain cap values, but it's what I have. Also have 3 Maxwell caps, a 31976 and two 31393's. I don't think any of the maxwells have a pulse rate suitable for TC use. They just sit around gathering dust.  I have several transformers available:  5KVA 14.4 pole pig, 1.3 KVA 13,200 volt potential transformer, two identical 12 KV @ 60 mA NST's and a 7.5 KV @ 120 mA NST.
>         Anyone familiar with the GE cap?
> Thanks,
> Bob
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