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Re: Variacs, HV Jell, and LTRS Caps

to: Terry

They are approx equivalent in operation.  If you want used units we have 64
variacs, 240 VAC, 28 amp in stock.  Also have some smaller 120 VAC approx
7-10 amp range.

Regards,

Dr.Resonance




-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Sunday, May 16, 1999 11:43 PM
Subject: Variacs, HV Jell, and LTRS Caps


>Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
>
>Hi All,
>
> I am building a new control box and I was going to get another variac.
>Superior Electric and Staco come to mind and I was just wondering if one is
>better than the other in any way?  Staco is a bit more expensive but if
>they are somehow better it would be worth the few extra dollars.
>
> Also, I am working on a new MMC cap design that will require that they be
>submersed in oil.  I am running them above their ratings (in the "enhanced"
>mode :-)) taking advantage of the fact that "I know things" :-))  Since oil
>is such a mess, I was wondering if mixing mineral oil and say paraffin
>would produce a jell that could be heated to flow but would solidify like
>grease when cooler?  The jell would not be a dielectric but more of an
>insulator and mounting medium to put the caps in nice PVC cases.  The
>advantage would be it would not run, spill, leak, etc.  If this works, I
>can make a 5.6nF cap for about $25!!  If it doesn't, I don't want to have
>to clean up a bunch of oil :-))  This will test if the manufactures ratings
>really do mean anything in Tesla coil applications.  I am running just over
>the edge in voltage and current but theoretically they should hold up very
>well.  My present MMC runs soooooo cool I think it may be a waste of money
>to over design these things too much.  More exploration of their limits is
>called for.  Since I have all my stuff modeled, I can predict RMS currents
>and voltages very well so as to push the rating of the parts "gently"...
>
> I have been running a small coil off a 27nF (larger-than-resonant-sized
>(LTRS)) cap with a 15kV/60mA transformer the last few days.  All seems to
>be working as expected and the output seems much better than my old 17nF
>configuration.  Much more to learn about this.  I think this is a very
>promising area despite the theoretical complexities.  Much more to come
>about this...
>
>Any thoughts are welcome...
>
> Terry
>
>