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Re:Tube Type Tesla Coils




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At 12:07 AM 3/9/97 +0000, you wrote:
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>Date: Sat, 8 Mar 97 18:58:00 +0000
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>To: Tesla List <tesla-at-pupman-dot-com>
>From: richard hull <rhull-at-richmond.infi-dot-net>
>Subject: Re: [Fwd: Tube Type Tesla Coils]
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>At 03:00 AM 3/7/97 -0600, you wrote:
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>>To: Tesla List <tesla-at-pupman-dot-com>
>>From: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
>>Subject: Tube Type Tesla Coils
>>Date: Thu, 6 Mar 1997 06:30:50 +0000
>>Message-ID: <19970306063047.AAA6754-at-LOCALNAME>
>>
>>
>>To All -
>>
>>I have noticed lately that sometimes over 50% of the Tesla List postings
>>refer to tube type TC's. It should be noted that tube type TC's are not true
>>Tesla coils.
>>
>>Tube TC's operate with continuous sine waves from a radio transmitter type
>>of power supply. The load on the transmitter is not the usual resistive
>>antenna type load but a reactive coil circuit load. This device uses coils
>>and capacitors in a much different manner than the way they are used in
>>standard Tesla coils. There is no charging of a primary capacitor to create
>>dampened sine waves like the typical classical TC, etc. This type of
>>operation produces brush type sparks and sometimes disruptive sparks
>>depending on the adjustments.
>>
>>The tube operation and the classical coil TC (or magnifier) operation are
>>two completely different methods of producing sparks. The standard classical
>>TC operates with a VSWR of about 10 to 1000 while the tube TC operates with
>>a VSWR of about 1 to 3 like most radio transmitters. I show a graph of these
>>two types of operation in the Tesla Coil Notebook. Has anyone tried to
>>measure the VSWR of their classical or tube coils? The Corum's said they had
>>made these measurements but gave no details. I have tried to make these
>>tests but did not have much success.
>>
>>At one time I started to add a chapter to one of my books that would cover
>>tube TC's. I soon realized that I could not find enough information on these
>>devices to develop a method of engineering design criteria that was possible
>>with the typical classical TC's. 
>>
>>It appears that now there are several coilers that have enough information
>>to write a tube TC book and publish it for other coilers interested in this
>>type of device.
>>
>>My question is " Should tube TC's be on a separate Tesla List of it's own?".
>>Coilers who are interested in tube types will then not have to scan thru
>>classical coil (or magnifier) postings to find the information they need.
>>
>>John C. 
>
>John
>>
>>I would think that as long as a system is 1.designed to produce spark - 2.
>does so using the good office of resonance - 3. utilizes at least two
>inductive devices in achieving this goal,  it can be called a real tesla coil.
>
>  This same issue came up in the 1992 letters to the editor of Popular
>Electronics regarding Duane Bylund's coil.  It evidently didn't quack or
>look enough like a duck to many "suppossed" Tesla coilers to be classed as
>such.  A number of folks lined up in the letter column to denigrate what was
>probably the best modern embodiment of one of Tesla's grandest ideas - the
>magnifier.  This is exactly what Bylund had made, complete with the three
>coil design. 
>
>How we excite a system is of little concern unless we are looking for
>efficiency, and even then, efficiency in what area?  Whether it is a spark
>gap, hydrogen thyratron, hard tube oscillator, FET, transistor, Quadrac, or
>SCR, it matters not as long as the energy from the switch or non-linear
>device winds up resonant and produces spark.
>
>
>If it resonants and shoots spark, it is a Tesla system.
>
>
>Richard Hull, TCBOR
>
>----------------------------------------

Richard -

 There were 114 postings today. This number will probably keep increasing. I
would like to keep this under control. 

 I am not saying that tube type Tesla coils are not interesting, just that
there appears to be enough information for a separate List. The quacking has
nothing to do with it. 

In fact I would be interested in hearing from anyone who has tried to
measure the VSCR of a classical or tube type Tesla coil. As I said before I
did not have much success with these measurements. This surprised me because
Ham operators make these tests on radio transmitters all the time.

John C.

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