Re: BIG VTTC project

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

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

I could not imagine the day that i was able to destroy a pig (sorry 
"distribution transformer" :)) to make a lousy filament 
transformer!  Really its only about 160watts of power per tube, so i dont 
see why you could not get away with making it from something smaller (like 
an NST core, or a MOT core).  Ive made 2 fil supplies from NST cores.  1 is 
a 10v 13A for a 304TL, and the other is a 10v 20A for a dual 833A 
coil.  Some cores are better than others when it comes to vibrations.  With 
the latter transformer, i had problems with the tubes rattling from the 
transformers intense vibrating!
So i had to shock mount it (isolate) from the coils chassis.

Greg, good luck, and i hope to see you pursue this project.

Steve Ward.






>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: BIG VTTC project
>Date: Thu, 02 Jan 2003 18:10:14 -0700
>
>Original poster: "Dr.Resonance by way of Terry Fritz 
><teslalist-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>
>
>
>You could easily obtain all four of your 7.5 volt, 21 amp, filiment
>requirements from a rewound pole xmfr.  Keep the 220 volt primary on and cut
>off the HV winding.  They wind on 4 separate filiment windings.  We found it
>works out to approx 1 volt per turn, but do a 10 turn test to make sure.
>
>You can use this technique to produce a xmfr to provide filiment currents up
>to 60 Amperes from any standard pole xmfr core with primary (240 VAC)
>winding left on and stripping off the HV winding.
>
>Dr. Resonance
>
>
>
>
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Thursday, January 02, 2003 12:00 AM
>Subject: Re: BIG VTTC project
>
>
> > Original poster: "Steven Ward by way of Terry Fritz <teslalist-at-qwest-dot-net>"
><srward16-at-hotmail-dot-com>
> >
> > Hi Greg,
> >
> > A quick look up on the 4-1000A tube shows a max plate of 6kv at 600ma, i
> > believe.  Hmm, even for just one, how do you suppose you will supply these
> > big tubes?  And how many so you suppose that you would use?  I bet a pair
> > would make one heck of a coil!  Sorry i dont have much tech stuff to
>offer.
> > But i do offer my support!  I would really be interested in seeing a coil
> > of that power being built.  Im working on a dual 833A coil.  But im still
> > learning.  Im sure that someone would know the feasability of using
> > 4-1000A's as a VTTC tube.  IT seems like it would work.  7.5v 21A
> > filaments, oughhh, thats a big transformer!  And im sure your plate supply
> > will also be a back breaker!  and a circuit breaker :)
> >
> > Good luck!
> >
> > Steve Ward.
> >
> >
> >
> >
> >
> >
> > >From: "Tesla list" <tesla-at-pupman-dot-com>
> > >To: tesla-at-pupman-dot-com
> > >Subject: BIG VTTC project
> > >Date: Wed, 01 Jan 2003 20:22:43 -0700
> > >
> > >Original poster: "Gregory Peters by way of Terry Fritz
> > ><teslalist-at-qwest-dot-net>" <s371034-at-student.uq.edu.au>
> > >
> > >Hello all,
> > >
> > >I can get some near new 4-1000 valves pretty cheaply. These are a 3kW
> > >rated transmitting tetrode. How would these go in a VTTC? What
> > >configuration should I use (should I wire the screen and grid
> > >together and use as a triode)?
> > >
> > >Cheers,
> > >
> > >Greg.
> >
> >
> > _
> >
> >


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