RE: ~Variac question

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Gary.Lau-at-compaq-dot-com>

Good guess!  I measured 184 mA RMS leaving the NST HV bushing, measured
with the fiber optic probe and RMS function of a Tek scope.  And this is
with no modifications to the NST shunts.  I have always run with the volume
set to "11", and have had no problems.  I have noted that the NST will get
warm after a couple minutes, actually re-melting a portion of the Vaseline
jel that it's potted in, but I've seen no permanent ill effects.

Gary Lau
MA, USA

>Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
>
>Hi Gary,
>
>Oh!!!  I wonder if the magnetic shunts are saturating?  They would almost
>have to be.  I bet it is putting out a whole lot more than 60mA.  I would
>guess about 150mA!!  That's cool if it does not blow up.
>
>I have wondered if a stable and safe coil could be made with a NST far into
>saturation.  It looks like you have done it :-))  This is a very
>significant thing!!!
>
>Cheers,
>
>	Terry


At 08:59 AM 2/16/2002 -0500, you wrote:
>That measurement actually was made with 240uF of PFC!
>
> -----Original Message-----
>From: 	Tesla list [mailto:tesla-at-pupman-dot-com] 
>Sent:	Friday, February 15, 2002 9:23 PM
>To:	tesla-at-pupman-dot-com
>Subject:	RE: ~Variac question
>
>Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
>
>Hi Gary,
>
>Adding 200uf of PFC caps could probably cut that current draw in HALF!
>
>Cheers,
>
>	Terry
>
>
>At 09:16 PM 2/15/2002 -0500, you wrote:
>>My 15/60 NST pulls upwards of 20 Amps when cranked to 140V.  I use a 15A 
>>Variac that I found at a flea market for $12.  If there are no flea markets, 
>>ebay always has a good supply.
>>
>>Gary Lau
>>MA, USA
>
>