Re: 811A first light

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

Original poster: "Brent Turner by way of Terry Fritz <twftesla-at-qwest-dot-net>" <bturner-at-apc-dot-net>

Hi Robert...

Didn't mean to tread on any trademarks there... :-)

Regarding the 4-1000, I was thinking more on the lines of something
similar to John's pulsed-staccato mode. Averages the current on the
plate to prevent that 'Chernobyl' effect...

How long an arc would you expect off that 3-10,000???

- brent


Tesla list wrote:
> 
> Original poster: "Area31 Research Facility by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <rwstephens-at-hurontario-dot-net>
> 
> Unfortunately I never saw any of the previous postings on this thread.
> 
> Although I see Brent was careful (thanx Brent) to preface this carefully as
> 'Hooooeeeey!', I wish to point out that as the inventor of the Coronatron I
> reserve the intellectual property copyright on this name and immediate family
> of descendant derivatives.  I will not consider releasing it until it has
made
> me at least ten cents profit.
> 
> As for the 4-1000.... I fully recognize that employing whatever
components that
> one can lay their hands on in the Tesla coil hobby is the rule, however I
have
> this to say. I get 22" out of a single 833A (without tube damage).  I would
> expect 28" or better from a 3-1000 (an experiment I've never tried).  From a
> 4-1000 I would expect possibly 24" but more likely grief, a melted screen
grid
> and thusly a ruined tube.  Tetrodes are ill suited to this application, which
> would explain why industry doesn't use them in self-driven industrial
> oscillators.  There is no shortage of entirely adequate large transmitting
> triodes available for this application.
> 
> Dr. John, sell that new brand 4-1000 and socket to an amateur who needs
it for
> his big homebrew linear (ebay hint hint) and use the money to buy a valve
with
> one less 'ode.  If you have a TV station plate xfmer it sounds like a
tube even
> beefier than a something-1000 is in order. Try to find an external anode
> glass-metal 3-2500 or newer ceramic-metal 3CX2500 with flying filament leads.
> I had one until recently when, since I'm not doing any coiling anymore,
it got
> traded for a vintage TV set to an amateur who wanted it to melt ice off his
> antenna.   I have an Eimac 3CX10,000D which I'd trade for the right,
round CRT
> vintage TV set, ....if you want to get really creative.
> 
> If you are an amateur that wants to melt ice off his antenna quickly, I also
> have a Eimac 4CX15,000D with socket and filament transformer available.
> 
> Robert W. Stephens
> Director
> AREA31 Research Facility
> AREA31 Radio Observatory
> Co-curator
> Hangar31 Vintage TV Museum
> <http://www.area31-dot-org>www.area31-dot-org
> 
> 
> ----- Original Message -----
> >
> > From: <mailto:tesla-at-pupman-dot-com>Tesla list
> > To: <mailto:tesla-at-pupman-dot-com>tesla-at-pupman-dot-com
> > Sent: Wednesday, July 11, 2001 09:25
> > Subject: Re: 811A first light
> >
> > Original poster: "Brent Turner by way of Terry Fritz
> > <<mailto:twftesla-at-qwest-dot-net>twftesla-at-qwest-dot-net>"
> > <<mailto:bturner-at-apc-dot-net>bturner-at-apc-dot-net>
> >
> > Hooooeeeey!
> >
> > Son of CoronaTron???  :-)
> >
> > You should be able to get 24" of discharge with a 4-1000. Especially if
> > you overvolt the plate. (For *short* run times...)
> >
> > - brent
> >
> >
> >
> > Tesla list wrote:
> > >
> > > Original poster: "Dr. John Gudenas by way of Terry Fritz
> > <<mailto:twftesla-at-qwest-dot-net>twftesla-at-qwest-dot-net>"
> > <<mailto:comsciprof-at-ameritech-dot-net>comsciprof-at-ameritech-dot-net>
> > >
> > > Hi Brent
> > > No argument, I should have elaborated more on "device". Note the size
of my
> > > grid leak resistor just to keep three 811A's happy and allow run time
up to
> > > 4 minutes before the plates are cherry red and this is around 500 mA.
> > > However, all is about to change. I was with Bert Hickman at a local Ham
> > fest
> > > last weekend and picked up a NOS  GE 4-1000A and Eimac socket. I have a
> > > plate transformer from an old TV station and all the other parts I need
> > (but
> > > time). When it lights, I'll post the list. Thanks for filling in the
> > > details.
> > > John W. G.
> >