Re: NST vs. MOT ???

You can series up two MOT's with no problem, but when you start to series
more, you run into an insulation breakdown problem.  The insulation between
the core and the 110V winding isn't good for thousands of volts. IN a
typical MOT, one end of the HV winding is connected to the core and sits at
ground.  When you start seriesing, the core has to float at HV, and
breakdown between the core and the line winding is likely. 

Adding diodes and making DC doesn't help, BTW...

However, you could rig up a pair of half wave voltage doublers on the

> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: NST vs. MOT ???
> Date: Sunday, November 14, 1999 6:07 PM
> Original Poster: "jw" <jwhitmor-at-muscanet-dot-com> 
> Whenever something seems too obvious to me, I have learned to treat the
> conclusion with great suspicion. So
> here is your chance to completely demolish my reasoning.
> I have a 12kv/30ma classic (boat-anchor) NST I have treasured for years
> the source for my HV experiments.
> Besides, being heavy and electrically delicate, I am not
> sure the classic style NSTs are made anymore. I have
> no ready source for additional NSTs.
> On the other hand, just driving across town today, I snagged
> two discarded uW ovens destined for curbside pickup. Not
> only do they have the MOT, but also a HV diode and HV filter cap. (nice
> triac too).
> I calculate that MOTs can deliver from 140ma to maybe 300ma from a full
> uW oven.
> So why can't I take 3 of these MOTs rectified to DC with
> their associated salvaged parts, and series them like three 4.5kv
> (e.g. geinacher cascade)? Shouldn't I end up with a 12-15kv supply with
> 100ma output? All this for FREE and coming in under the weight of my 30ma
> NST.
> Even if dumpster diving isn't your idea of fun, the local Goodwill store
> lots of used working uWs for $10-$20.
> Oh, and no TAR in them either!