Re: Tube Coils.

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

Original poster: "Paul Marshall by way of Terry Fritz <teslalist-at-qwest-dot-net>" <klugmann-at-hotmail-dot-com>

Thanks to all for the info. This friend of mine is an HAM operator and I am 
sure he is aware of the risk, however I will forward this info on to him. 
Thanks for the input.



Paul S. Marshall





>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Tube Coils.
>Date: Sat, 01 Mar 2003 21:44:03 -0700
>
>Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><dhmccauley-at-spacecatlighting-dot-com>
>
>I agree.  I was running my SSTC today trying some audio modulation with
>200VDC input at about 1.5kW and I was getting nasty burns from touching my
>chassis controller which was about 10 feet away.  I mean real nasty.
>
>60kW????  Being in the room with a thing running at that power would be the
>same as touching your pole transformer primary voltage!  Downright extremely
>hazardous.  Might as well
>stand right in front of an open waveguide radiating the same power.
>
>The Captain
>
>
>
> >
> > John brought up a very good point!
> > An animal like that belongs in a faraday cage!
> > The RF field that a CW coil at that power level would produce would be
>very
> > dangerous. Mysterious fires could start in hidden places within the room,
> > and I would be very fearful about the high RF field damaging human tissue.
> > You may not feel the effects until it's too late.
> >
> > Sue
> >
> > ----- Original Message -----
> > From: "Tesla list" <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Saturday, March 01, 2003 7:05 PM
> > Subject: Re: Tube Coils.
> >
> >
> >  > Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
> > <FutureT-at-aol-dot-com>
> >  >
> >  > In a message dated 3/1/03 1:39:06 PM Eastern Standard Time,
> >  > tesla-at-pupman-dot-com writes:
> >  >
> >  > > >Original poster: "Paul Marshall by way of Terry Fritz
> >  > ><teslalist-at-qwest-dot-net>" <klugmann-at-hotmail-dot-com>
> >  > > >
> >  > > >I have a friend who recently aquired (2) 3CX10000 Tubes. He would
>like
> > to
> >  > > >make a tube powered coil. Does anyone have a schematic I could give
>him
> > ? I
> >  > > >think he is planning on winding a 6" or 8" diameter coil...
> >  > > >
> >  > > >Paul S. Marshall
> >  > >
> >  > >
> >  >
> >  >
> >  > Paul,
> >  >
> >  > Unless your friend has a lot of electrical power available, he may
> >  > want to use a pulsed (staccato) feature on the coil to reduce the
> >  > input power.  The size of the coil should depend on the desired
> >  > spark length.  I use the formula,
> >  >
> >  >     spark length inches = 0.49*sqrt input power
> >  >
> >  > for a tube coil.  So if 60kW input is used, the coil should give
> >  > 10 foot sparks.  If you figure you want the spark length to be
> >  > twice the height of the coil, then the secondary should be 5 feet tall.
> >  > I've obtained spark lengths up to almost 4 times the secondary
> >  > length on tube coils, but flashovers may be a problem.  Perhaps
> >  > 3 times the secondary length would be OK, making the secondary
> >  > about 3.3 feet tall.  Of course your friend could used just one tube,
> >  > or run the tube at less than its full capabilities, and keep the spark
> >  > length and power input lower.  If you want long sparks, then AC not
> >  > DC should be used for the plate supply.  Other than that you can
> >  > probably just scale up an existing tube coil schematic pretty much.
> >  >
> >  > If he wants to limit the secondary to 8" diameter, then a height of
> >  > 24" to 34" may be good, depending on the desired spark length.
> >  >
> >  > I wouldn't recommend being too close to the coil when it's running
> >  > if he uses the full capability of the tubes. It will be a fearsome
> >  > beast indeed !
> >  >
> >  > John
> >  >
> >
> >
> >