Re: LOTS OF H.V. STUFF !!!

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

Original poster: "John" <fireba8104-at-yahoo-dot-com> 

Hi BART,
Very nice stuff.Can you see if you can find any 15000volt 120ma neon 
transformers?
  I'll not be here to grace the list with my presence for a week so bye. :-(
Cheers,
John

Tesla list <tesla-at-pupman-dot-com> wrote:
Original poster: "BART"

HI ALL,

Check out this stuff I have on e-bay.
I would really like too see these items used for tesla use!!!
E-bay I.D : BA429 AND BA460

CHEERS,
BART A.


---- Original Message -----
From: "Tesla list"
To:
Sent: Wednesday, August 18, 2004 2:21 PM
Subject: Re: Diode Strings


 > Original poster: "David Rieben"
 >
 > Rick,
 >
 > You may wish to consider the diode "sticks" removed from an
 > x-ray HVDC generator (x-ray transformer). These diode "sticks"
 > are amazingly small for their mammoth voltage ratings.
 > (app. 1" wide x 6" long x 1/16" thick G-10 PCB with usually
 > 15 to 25 individual diodes soldered in a series configuration).
 > There are NO balancing resistors invovled here
 > either. They are generally rated at 150 kV pk -at- appr. 1 amp.
 > Of course they are designed to operate at or near their max
 > ratings submerged in oil and usually at a low duty cycle.
 > However they can easily withstand the relatively "low" voltage
 > from a 14.4 kV pig without the need for oil-submersion and the
 > current rating may be the only issue for a really high powered
 > coil.
 >
 > David Rieben
 >
 >
 > ----- Original Message -----
 > From: "Tesla list"
 > To:
 > Sent: Wednesday, August 18, 2004 8:34 AM
 > Subject: Diode Strings
 >
 >
 > > Original poster: "Richard W."
 > >
 > >
 > > Hi all,
 > >
 > > I have 200 1000V 6A diodes (6A10). Recovery time is ~2.5uS
 > >
 > >
 >
http://pdf.searchdatashe
 > ets-dot-com/pdf/266/266448.pdf
 > >
 > >
 > > I hope to use 30 in each leg of a bridge to rectify 14.4Kv from a pig.
 > >
 > > 6A10s are general purpose diodes so I doubt they're manufactured with
 > > comparatively tight tolerances. Seaching the mailing list I've read
 > > something that the first diode to turn off can take the full applied
 > > voltage and could cause failure if the diodes used aren't at least
close
 > to
 > > being matched. This seems plausible if the diode turned off at the
peak
 > of
 > > the AC voltage swing but that doesn't seem likely. If the diodes begin
to
 > > turn off relatively close to zero crossing then I don't see that it
would
 > > matter so much. Say I have 30 1000PIV diodes in a string with 15Kv
 > applied.
 > > Close to zero crossing the the collective voltage drops shouldn't even
be
 > > close to individual diode PIV. I know there are many that have had
success
 > > using 1N4007s but I'm just curious and maybe a bit cautious.
 > >
 > > So, am I missing something or is my logic in error?
 > > I've also read about pros and cons using voltage balancing resistors so
 > > that's on my mind too.
 > > And how does recovery time figure into a diode string operating at 60Hz
or
 > > is 60Hz too slow to even worry about?
 > >
 > > I prefer to ask first than use the "powerup/duck" method.
 > >
 > >
 > > Thanks!
 > >
 > > Rick W.
 > > Salt Lake City
 > >
 > >
 >
 >