Re: VTTC help

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

Original poster: "Steven Ward by way of Terry Fritz <twftesla-at-qwest-dot-net>" <srward16-at-hotmail-dot-com>

Well, this isnt my schematic.  And this is where you are a better man than 
i.  Im very bad at tube circuits, and this is kinda why i started this post. 
  I cant find any info on all of those small details of B+ or B- or how the 
tube oscillates, and every other detail that you could imagine!  I guess i 
could look for some old radio books or something, but does anyone have an 
online source that could really educate me about what in the world a hartley 
oscillator is??  I really need to start from ground zero, and begin to 
figure this tube technology and these very basic circuits.  But every VTTC 
site i read seems to be geared towards people that already know what they 
are doing.  Dont get the wrong picture about me, im excellent with 
distruptive coils, but i feel thats all that i really know.  I feel fairly 
competent to deal with the power of a single MOT.  So overall my problem is 
in the extreme basics of this circuit.  I really dont understand what each 
part does, and why it does what it does.  Maybe if i knew all of these 
things, i wouldnt have the problem of needing to copy a design, but rather 
be able to design my own.

About the specific question: where is the B+/-?  sorry im even to ignorant 
to answer this question!  All i can say is that wired according to the 
link's diagram, it works with some 3" sparks.

If anyonw can reccomend a good read about tube circuits, id appreciate it.  
Thanks,

Steve Ward.


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: VTTC help
>Date: Thu, 26 Sep 2002 13:54:16 -0600
>
>Original poster: "robert heidlebaugh by way of Terry Fritz 
><twftesla-at-qwest-dot-net>" <rheidlebaugh-at-desertgate-dot-com>
>
>Steve: Not to be to critical, but where is your B+ or B- supply to your 811
>tube? I see no power applied to the tube, only a grid bias and a floating
>cathode/fil with a grounded plate. Please review your schematic.
>    Robert  H
>
> > From: "Tesla list" <tesla-at-pupman-dot-com>
> > Date: Wed, 25 Sep 2002 17:22:00 -0600
> > To: tesla-at-pupman-dot-com
> > Subject: VTTC help
> > Resent-From: tesla-at-pupman-dot-com
> > Resent-Date: Wed, 25 Sep 2002 17:31:08 -0600
> >
> > Original poster: "Steven Ward by way of Terry Fritz 
><twftesla-at-qwest-dot-net>"
> > <srward16-at-hotmail-dot-com>
> >
> > Well i just got new caps.  They are Russian 470pf 20kv 60kvar.  I have 2 
>in
> > parallel, these are massive caps!! 500 grams each.  They are about 4"
> > diameter x 1" thick.  Anyway here is the coil i have copied.
> >
> > http://www.angelfire-dot-com/electronic/cwillis/811acoil.html
> >
> > I had the coil running on some old PP caps, but they got hot and slowly 
>lost
> > value.  So i put my new caps on there.  So im having some major problems
> > with tuning.  I dont really understand how this coil works!!  It doesnt
> > really say too much.  Why does this coil have 1 inductor(for the 
>primary)
> > with a centertap, rather than a primary and feedback winding??  Im 
>really
> > interested in tube coils, but i have yet to find a good explenation on 
>how
> > they work.  Also, i would love to revise this coil and make a larger 6"
> > diameter primary, and a taller 3.5" secondary.  If there is anyone out 
>there
> > who could perhaps help me to get a good start, or any start on this, i 
>would
> > really appreciate that.  If there is the interest in redesigning the 
>coil, i
> > can post a list of all of my components or parts on hand.  If anyone has 
>a
> > link to some good explenations, i would really appreciate that.  Thanks
> > guys,
> >
> > Steve Ward.
> >