Re: St. Elmo Burgers

Tesla List wrote:
> >From rwstephens-at-ptbo.igs-dot-netMon Aug 19 22:28:15 1996
> Date: Mon, 19 Aug 1996 19:13:00 -0500
> From: "Robert W. Stephens" <rwstephens-at-ptbo.igs-dot-net>
> To: tesla-at-pupman-dot-com
> Cc: 73041.2215-at-compuserve-dot-com
> Subject: St. Elmo Burgers
> All,
> I've just been awarded a contract to build a 10KW+, vacuum tube
> powered, CW mode Tesla coil for a big commercial client.  This unit will
> operate at 100 KHz.  In anticipation of the contract I have already
> delivered a 33 kVA, three phase plate transformer and filter choke to
> the customers RF room.  I propose to build them a big PA based on a
> 3CX10000D or 3CX15000D EIMAC transmitting triode excited by a variable
> frequency exciter oscillator which I have already built and delivered to them
> employing a single 833A triode.
> A recent head-on highway collision has left me immobile for the past
> three weeks on rather strong painkillers.....um, hello?  If my posts
> have seemed a bit odd, this is why.  I am not yet well enough to do
> the travel and legwork to gather the parts necessary for their
> desired  big TC, but I luckily have parts at home stockpiled for a
> 'someday personal project'  6 kW or more vacuum tube TC. I recently
> drug home two complete  RCA 10 kW AM broadcast transmitters (BTA10K)
> and have lots'a neat high power RF parts.
> The client has agreed, in sympathy for my temporary disability, to
> pay me to build my 6 kilowatt TC and use it on loan until I am well
> enough to build them 'the big one'.  I will retain ownership of this 6 kW
> unit.
> This unit is beginning to take shape in my shop now.  4.3 kVA plate
> transformer will deliver about 4 KVDC with a cap input filter power
> supply. A dual gang 20 amp variac on the 230 volt single phase mains
> will control this transformer (this should be good for about 6-7 kW
> input DC to the oscilllator here at home in short duty cycle).  A pair
> of EEV BR1160 triodes (5kW plate dissipation each) in parallel will
> be employed.  I can get  5 kW out of a single one of these
> tubes, but I proposed to the client that when I delivered my
> temporary unit, I will hook it up to their much bigger plate
> transformer as an ouboard cluge and really push it.  I might get 10 kW out of my
> system this way, so I've really got to overbuild it!
> I hope to have this unit completed within 6 weeks and will let y'all
> know how my own 'Welding Torch from Hell' turns out.
> This is definitely a neat project!
> The resultant discharge will be a large Type 3.  Before I deliver it I propose to
> hang a plastic tarp around the top terminal to protect the coil system from
> drips, and have a weenie roast using bamboo sticks!  We're gonna call 'em St.
> Elmo Burgers!  I expect local fellow coiler Jeffrey Wiggins will be there.
> All other coilers are welcomed too!  This party should be sometime in
> late September.  E-mail me personally if you think you can make it.
> I'm 40 minutes northeast of Oshawa, Ontario, near a little place called
> Janetville.  If this happens, my present pride and joy, MTC will be
> set up as well.  It'll be a kindof a Teslathon, with eats.
> regards, rwstephens


Sorry I can't attend, but I'll be there in spirit!  At least you need not 
worry about Salmanilla poisoning or Botullism.  None of those nasty 
char-broiled "free radicals" either.  The "fully ozonated - St. Elmo 
burgers" leave a clean fresh taste in your mouth just like after a 
refreshing summer thunderstorm!  Hah!!

Richard Hull. TCBOR