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- To: Tesla List <tesla-at-pupman-dot-com>
- Subject: Re: [Fwd: Tube Type Tesla Coils]
- From: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
- Date: Mon, 10 Mar 1997 02:04:37 +0000
At 12:07 AM 3/9/97 +0000, you wrote: >Return-Path: <tesla-request-at-pupman-dot-com> >Received: from ns-1.csn-dot-net ([199.117.27.21]) by mail.stic-dot-net > (post.office MTA v2.0 0813 ID# 0-10265) with ESMTP id AAA200 > for <tesla-at-stic-dot-net>; Sat, 8 Mar 1997 13:32:31 -0600 >Received: from poodle.pupman-dot-com (slist-at-pupman-dot-com [204.133.95.34]) > by ns-1.csn-dot-net (8.8.5/8.8.5) with ESMTP id MAA15315 > for <tesla-at-stic-dot-net>; Sat, 8 Mar 1997 12:32:12 -0700 (MST) >Received: (from slist-at-localhost) by poodle.pupman-dot-com (8.7.6/8.7.1) id MAA20172; Sat, 8 Mar 1997 12:31:26 -0700 >Received: from ns-1.csn-dot-net (nameserv [199.117.27.21]) by poodle.pupman-dot-com (8.7.6/8.7.1) with ESMTP id MAA20141 for <tesla-at-pupman-dot-com>; Sat, 8 Mar 1997 12:31:04 -0700 >Received: from mh004.infi-dot-net (mailhost.infi-dot-net [208.131.167.6]) > by ns-1.csn-dot-net (8.8.5/8.8.5) with ESMTP id LAA14729 > for <tesla-at-pupman-dot-com>; Sat, 8 Mar 1997 11:57:59 -0700 (MST) >Received: from pa4dsp21.richmond.infi-dot-net (pa4dsp21.richmond.infi-dot-net [205.219.233.117]) > by mh004.infi-dot-net (Infinet-S-8.8.5) with SMTP id NAA30830 > for <tesla-at-pupman-dot-com>; Sat, 8 Mar 1997 13:58:00 -0500 (EST) >X-Envelope-From: rhull-at-richmond.infi-dot-net Sat Mar 8 12:31:25 1997 >Date: Sat, 8 Mar 97 18:58:00 +0000 >Message-ID: <199703081858.NAA30830-at-mh004.infi-dot-net> >X-Sender: rhull-at-richmond.infi-dot-net >X-Mailer: Windows Eudora Light Version 1.5.2 >To: Tesla List <tesla-at-pupman-dot-com> >From: richard hull <rhull-at-richmond.infi-dot-net> >Subject: Re: [Fwd: Tube Type Tesla Coils] >Mime-Version: 1.0 >Content-Type: Text/Plain; > charset="us-ascii" > >At 03:00 AM 3/7/97 -0600, you wrote: >>Return-Path: <tesla-request-at-pupman-dot-com> >>Received: from poodle.pupman-dot-com ([204.133.95.34]) by mail.stic-dot-net >> (post.office MTA v2.0 0813 ID# 0-10265) with ESMTP id AAA275 >> for <tesla-at-stic-dot-net>; Thu, 6 Mar 1997 00:41:11 -0600 >>Received: (from slist-at-localhost) by poodle.pupman-dot-com (8.7.6/8.7.1) id >XAA19911; Wed, 5 Mar 1997 23:38:15 -0700 >>X-Envelope-From: couturejh-at-worldnet.att-dot-net Wed Mar 5 23:38:14 1997 >>Received: from mtigwc03.worldnet.att-dot-net (mailhost.worldnet.att-dot-net >[204.127.131.3]) by poodle.pupman-dot-com (8.7.6/8.7.1) with ESMTP id XAA19507 >for <tesla-at-pupman-dot-com>; Wed, 5 Mar 1997 23:30:29 -0700 >>Received: from LOCALNAME ([207.147.153.14]) by mtigwc03.worldnet.att-dot-net >> (post.office MTA v2.0 0613 ) with SMTP id AAA6754 >> for <tesla-at-pupman-dot-com>; Thu, 6 Mar 1997 06:30:50 +0000 >>X-Sender: COUTUREJH-at-postoffice.worldnet.att-dot-net (Unverified) >>X-Mailer: Windows Eudora Light Version 1.5.2 >>Mime-Version: 1.0 >>Content-Type: text/plain; charset="us-ascii" >>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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