Re: [TCML] New high voltage source for VTTC

[DC Cox <resonance@xxxxxxxxxxxx>]

What are the ratings for the GU5B tube?   Plate voltage DC and current
(max)?

Dr. Resonance




On Tue, Feb 10, 2009 at 7:49 AM, Liviu Vasiliu <teslina@xxxxxxxxx> wrote:

> Dr Resonance
>
> The pole pig xfrms are just a dream for me...Anyway, thanx for the idea.
>
> teslina
> >
> >
>
>
> --- On Tue, 2/10/09, DC Cox <resonance@xxxxxxxxxxxx> wrote:
>
> > From: DC Cox <resonance@xxxxxxxxxxxx>
> > Subject: Re: [TCML] New high voltage source for VTTC
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Tuesday, February 10, 2009, 12:35 AM
> > I unwind pole xmfrs to get down to 5 kV to drive 833Cs.
> >
> > You could do the same.  By unwinding the outer sec layer
> > you can set your
> > voltage to anything you require in the 4 to 14.4 kV range.
> > I use the
> > smaller
> > 7,200 Volt pole xmfrs as then only 3-4 outer layers have to
> > be removed to
> > get to the 5 kV ACrms output required.
> >
> > I recase them in a steel box 18 x 18 x 17.5 (high) inches
> > and then use a
> > phenolic top for the 220V input and HV output.  In this
> > smaller box the
> > weight
> > goes from the stock pole xmfr weight of 285 lbs down to 110
> > lbs.  Nice
> > compact unit that can deliver up to 20 kVA on shorter duty
> > cycles.
> >
> > Dr. Resonance
> >
> >
> >
> >
> >
> > On Sun, Feb 8, 2009 at 9:55 PM, alfred
> > <alfred@xxxxxxxxx> wrote:
> >
> > > Hi list
> > >
> > > I am slowly building a new VTTC with a big russian
> > tube (GU5B) and I needed
> > > a more powerful high voltage transformer to power it.
> > Unfortunately I have
> > > only small MOTs with different outputs, so it would be
> > hard to simply
> > > parallel them.
> > >
> > > So, I designed a powersource, using the MOTs I have in
> > hand. The doubler
> > > cap will charge at the higher voltage from the biggest
> > MOT and the currents
> > > will add to another through some unidirectional paths
> > (using HV diodes). I
> > > tryed the new source with one of my VTTCs and the
> > results seem to be
> > > satisfactory.
> > >
> > > The design discussion, drawings, setup pics and movies
> > are published here:
> > >
> > >
> > http://4hv.org/e107_plugins/forum/forum_viewtopic.php?60496
> > >
> > > The suggestion from the forum guys was simply parallel
> > the MOTs, because
> > > the power dissipation from the leaking current would
> > be too small to
> > > consider, but I was worry to not loose power (the
> > output difference from the
> > > MOT secondaries was 92 V at full mains voltage = 220
> > V). Another variant was
> > > to take off the shunts and modify the number of turns
> > in the MOT primaries,
> > > but I was too afraid to not damage the xfrms (it is
> > hard to get them here).
> > > So, maibe I have chosen the complicated way, but still
> > it seems to work.
> > >
> > > teslina
> > >
> > >
> > >
> > >
> > >
> > >
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>
>
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