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

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>

Daniel,

Well, yes and no :^) There won't be much difference in the output
sparks of the transformer with the diodes in place (DC) as op-
posed to them removed (AC). However, as Mike stated, con-
tinued shorting of the output, even with proper ballasting, will even-
tually kill the diodes, which will result in the output going to prac-
tically zero. At this point, the only remedy is removing the diodes
and going AC. Once an x-ray tranny is made AC, it becomes much
more "robust"  ;^)

David Rieben

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, April 30, 2005 10:32 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.