LOTS OF H.V. STUFF !!!

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

Original poster: "BART" <BAPLATING-at-TDS-dot-net> 

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" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, August 18, 2004 2:21 PM
Subject: Re: Diode Strings


 > Original poster: "David Rieben" <drieben-at-midsouth.rr-dot-com>
 >
 > 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" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Wednesday, August 18, 2004 8:34 AM
 > Subject: Diode Strings
 >
 >
 >  > Original poster: "Richard W." <potluckutk-at-comcast-dot-net>
 >  >
 >  >
 >  > Hi all,
 >  >
 >  > I have 200 1000V 6A diodes (6A10). Recovery time is ~2.5uS
 >  >
 >  >
 >
<http://pdf.searchdatasheets-dot-com/pdf/266/266448.pdf>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
 >  >
 >  >
 >
 >
 >