Re: NST can't power Jacobs ladder!?

Jacob's Ladders are sometimes balky and difficult to adjust.  I powered one
with a 9kvac-at-60ma NST, and the arc refused to rise.  It just stayed in one
spot.  Ditto for another ladder powered by a hefty 2KV MOT (the arc was hot
enough to weld with!).  The flaming arc was most impressive, but it
wouldn't move upward.  However, my 15kvac/30ma NST ladder worked flawlessly
with only a few minutes tinkering to get it adjusted.  Just one of those


At 05:15 PM 09/01/1999 -0600, you wrote:
>Original Poster: Jan Florian Wagner <jwagner-at-cc.hut.fi> 
>Am I missing something here, or is it really that NSTs can't power a
>Jacobs ladder? Both of my 8kv 50ma NSTs rated 400VA did light an array of
>neon tubes really bright as I tested them. Couldn't measure any
>internal shorts and no "burn throughs" (at least not below 2000 MOhm)
>in either NST - they seem perfectly ok !?
>But the Jacobs ladder simply doesn't want to work. Just a dim, blueish
>arc, that stays where it started (~4mm). Electrodes are perfectly clean.
>NST centertap is grounded. The ladder did work nicely with a tiny TV
>I thought that at 50ma you should at least get some sort of small flame?
>Any ideas?
> Jan Florian Wagner
> jwagner-at-cc.hut.fi, petwag-at-kolumbus.fi
> http://www.dsh.edu.hel.fi