Re: 833 coil

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

Original poster: robert & june heidlebaugh <rheidlebaugh-at-desertgate-dot-com> 

John: several schematics have been posted on the net. The output of a 12v
transformercan be reduced by placing a short circuited bridge rectifier in
series with the output this will drop the voltage 2 volts. A micro wave oven
transformer will suply about 2.2 Kv at 1 amp to suply an 833 tube. free.
       Robert   H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Fri, 26 Sep 2003 20:27:59 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: 833 coil
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Fri, 26 Sep 2003 20:31:52 -0600
 >
 > Original poster: "John Richardson" <jprich-at-up-dot-net>
 >
 > Hi,
 >
 > I recently acquired an 833a tube, and would like to proceed with making a
 > coil.  The only requirement that I want to impose on this project is
 > longetivity, even at the expense of spark length.  The goal is to be able to
 > run for extended periods without worrying about tube damage, allowing for
 > various experimentation.
 >
 > Due to time constraints, I am hoping plagiarize a working, single tube
 > design.  After I have an operational coil, I can then proceed to alter
 > parameters to notice their effect.  Also, due to a relative lack of
 > knowledge with electronics, I believe that going with an existing design
 > will allow for a better learning experience than continuously fiddling with
 > component values that I know nothing about.  Here goes:
 >
 > 1)  10v 10A filament transformers seem impossible to find.  Would I be able
 > to use the trans out of a 12 volt battery charger and throttle it back with
 > a variac?  Or, would it be better to use a MOT with the secondary removed
 > and wind a few turns of wire on it like everyone else has done?
 >
 > 2)  Plate transformers designed to feed an 833 are super expensive and
 > heavy.  MOTs again?
 >
 > 3)  Does anyone have a link with a solid, simple one tube design that they
 > would be willing to share?  It's my understanding that a lot of the
 > component values aren't critical, but since I'm the type of person who has
 > to be hands on to learn, they would assist me in getting together a project
 > where results can be seen.
 >
 > 4)  I have gone thru the archives and done lots of reading on other's
 > projects to alleviate you guys from reiterating what has been said many
 > times, as well as making countless visits to Steve W's, John F's, and others
 > websites.  I've read the tube section of my old AARL Handbooks many times as
 > well, and am getting an understanding on the tube process.  However,
 > assembling a project that I know will perform seems to help ease the mental
 > anguish and promote an understanding of what I am doing.
 >
 > 5)  I've got two of John F's small toroids (2 by 6?).  Will I need something
 > bigger?
 >
 > 6)  I have to ask:  How much spark can I expect with a durable design?
 >
 > Thanks for any info,
 >
 > John Richardson
 >
 >