Re: Tube Coils.

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

Original poster: "S Gaeta by way of Terry Fritz <teslalist-at-qwest-dot-net>" <sgtporky-at-prodigy-dot-net>

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
 >