Re: Useful HV PSU's from x-ray equipment

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

It will if you're looking for the "climbing arc" effect like a jacob's ladder.

Mike
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, April 30, 2005 11:32 PM
Subject: Re: Useful HV PSU's from x-ray equipment


> Original poster: "Daniel Koll" <dk_spl_audio@xxxxxxxxxxx>
>
> Oh ok, I will remove the diodes when I get a chance.  Will doing this 
> improve arcs?  Thanks
>
> > From: "Tesla list" <tesla@xxxxxxxxxx>
> > To: tesla@xxxxxxxxxx
> > Subject: Re: Useful HV PSU's from x-ray equipment
> > Date: Fri, 29 Apr 2005 07:42:41 -0600
> >
> > Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>
> >
> > Sounds like the output is still in dc mode. If you take it apart and 
> > remove the rectifiers it will be ac. With small transformers like that 
> > (prob rated 10 mA or so, might be able to get 30-40 mA for short runs 
> > without frying it) you will still get the 60 Hz buzz, but with 10 mA it 
> > won't pull much farther than the starting distance (like an obit). Dead 
> > shorting it in dc mode will eventually kill the rectifiers.
> >
> > Mike
> > ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> > To: <tesla@xxxxxxxxxx>
> > Sent: Thursday, April 28, 2005 7:19 PM
> > Subject: RE: Useful HV PSU's from x-ray equipment
> >
> >
> > > Original poster: "Daniel Koll" <dk_spl_audio@xxxxxxxxxxx>
> > >
> > > Cool!  I just got a Xray transformer.  It is not nearly as big as those 
> > > though.  I would say about the size of two 15/30 NSTs.  It is filled 
> > > with oil and probably weighs around 35lbs.  It works on 115VAC mains or 
> > > pusled DC (seperate terminals).  It also has a spot to connect a ammeter 
> > > (if not used you ground this terminal to case).  I hooked it up and it 
> > > produced a very loud 3-4" blue arc.  The arc was very different than NST 
> > > arcs though. I took a picture and the one arc was made up of many small 
> > > blue streamers.
> > > The freq must have been higher than mains.  The wierd thing was that 
> > > once I established an arc I could not hold it and "pull" it apart.  The 
> > > max length was about the length that it could jump in air, not sure 
> > > why?  Oh yeah, forgot to mention, I was limiting current using a MOTs primary.
> > >
> > > > From: "Tesla list" <tesla@xxxxxxxxxx>
> > > > To: tesla@xxxxxxxxxx
> > > > Subject: Useful HV PSU's from x-ray equipment
> > > > Date: Thu, 28 Apr 2005 10:49:56 -0600
> > > >
> > > > Original poster: "Carl Litton" <Carl_Litton@xxxxxxxxxx>
> > > >
> > > > In our recent research, we have been extensively testing and modifying
> > > > used x-ray equipment to make it useful for Tesla projects and other high
> > > > voltage work.  The majority of postings that we have seen here regarding
> > > > the use of x-ray transformers and controllers have been negative.  The
> > > > consensus of opinion seems to be that this equipment is too dangerous,
> > > > too complicated, and generally not useful.  We have found this to be
> > > > anything but true.
> > > >
> > > > The transformers themselves are truly amazing in their potential to
> > > > produce voltages to nearly a quarter of a megavolt in some cases.  A few
> > > > simple modifications will convert them in to useful durable AC power
> > > > supplies that may be operated at 120V or 240V input from residential
> > > > mains.  These modifications include removal of rectifiers and low
> > > > voltage circuitry and reconnecting the secondaries in various
> > > > configurations to achieve the desired output from the available input
> > > > voltage.
> > > >
> > > > The controller boxes/panels may also be modified to provide control that
> > > > often exceeds even the most beefy and expensive of commonly seen Variac
> > > > type controllers.  Most contain very heavy duty selectable output
> > > > autotransformers that can handle continuous duty current at 100, 200 or
> > > > more Amps.  Although the units may appear complex, the modifications
> > > > needed to make them useful for HV work are quite simple - quickly and
> > > > easily done with common hand tools.  By stripping and removing the oil,
> > > > many of these units may be reasonably shipped without having to resort
> > > > to motor freight options.
> > > >
> > > > For anyone interested, we have written and published a preliminary
> > > > article to our site, which gives the details of these modifications for
> > > > most of the common types (single/dual transformers, grounded and
> > > > floating secondaries, full-wave bridge and non-bridge rectification,
> > > > series and parallel rewiring) of units that are available these days:
> > > >
> > > > http://hvgroup.dawntreader.net/rework.html
> > > >
> > > >
> > > >
> > > > Comments and questions are welcome as always.  We are more than willing
> > > > to amend the page with amplifications, clarifications, and corrections.
> > > >
> > > >
> > > > Carl Litton
> > > > Raleigh-Bartlett Science Club