Re: VTTC help

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

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.
> 
> _
> 
>