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- To: tesla-at-pupman-dot-com
- Subject: Re: Tube Type Tesla Coils
- From: "Robert W. Stephens" <rwstephens-at-headwaters-dot-com>
- Date: Sat, 8 Mar 1997 11:58:15 -0500
- Comments: Authenticated sender is <stephens-at-mail.headwaters-dot-com>
- Priority: normal
- Reply-To: rwstephens-at-headwaters-dot-com
> 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 > > 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, All, The points you make that a Vac tube TC is not *technically* a true Tesla coil are well taken and I agree. Note also that Magnifiers are as different from a classical two coil T.C. as a vac tube T.C. is. However by a circumstance of history, a Magnifier IS BY VIRTUE OF ITS INVENTOR a real Tesla coil. : ) For the convenience of keeping RF generated arcs and sparks all in one place, I vote on keeping chatter about vac tube T.C.'s on this list. IMHO, rwstephens
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