Re: Hosfelt snubber caps

["sundog" <sundog-at-timeship-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hi ,

  The bleeders I recommend DigiKey (movs while you're at it, if
possible, and 1kv1A diodes, nothin' like a 15kv[rectified to
21.21kv] for tinkering)...  My resistors and diodes cost me $38.??
total.  1000 of each, and the resistors were only around $12-13 i
believe.  For what you pay at RS for the resistors, you'd probably
get a lot more and just have to wait a few days.  My order arrived
in clearwater, FL, around 3-4 days after I sent for it.  Get the
half watt resistors, they work great :)

4 strings shouldn't do too badly, but you'll want to monitor it for
heating.  Air spaces between the caps, and a good low-inductance
connection to 'em all should do it!
                                            Caio

-----Original Message-----
From: Tesla list <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Friday, September 08, 2000 9:19 PM
Subject: Hosfelt snubber caps


>Original poster: Tesla729-at-cs-dot-com
>
>Hi Terry, all,
>
>I was just letting everyone know that I finally broke down and
>ordered 60 of those 0.1 uFD, 3000 VDC snubber caps from Hos-
>felt today,that was discussed on this list a couple of months ago.
>I'm wanting to replace the current 0.018 uFD, 60 KVDC Chicago
>Condenser single unit cap that I am currently using in my 15/
>90 NST driven system as it seems very lossy and heats up in
>a short order after the coil is turned on. I am also wanting to
re-
>do the primary and secondary coils for a more efficient design
>(I guess I am pretty much rebuilding the whole coil). Anyway,
>I have a few questions to place on the list regarding the use of
>these caps as an MMC.
>
>First, I was thinking of going w/ 4 strings of 15 (60 total) for a
>total value of 27nFD -at- 45 KVDC. This will be my 1st real at-
>tempt -at- a MMC cap and I was wondering if 4 strings of these
>would be enough to handle the current of a 15/90 NST bank?
>Without going into the mathematical equations, I figure on ~
>5 nF per 30 mA as resonant for NSTs. So, I am figuring 27 nF
>should make for a LTR cap setup for the 15/90 NST?
>
>Also, I was hoping someone could suggest a good source for
>1/2 or 1 watt, 10 meg bleeder resistors (preferably some local
>jobber like Radio Shack). Thanks in advance for your answers.
>
>Safe coiling,
>David R.
>
>
>
>