Re: Martin Damev:Re: [TCML] Sloans high power VTTC

[DC Cox <resonance@xxxxxxxxxxxx>]

typo error here.  It was an 18 turn sec inductor.  As I recall copper tubing
with active water circulation in the center to dissipate the enormous heat
at 150 kVA.

DC

On Sun, Dec 6, 2009 at 10:46 AM, DC Cox <resonance@xxxxxxxxxxxx> wrote:

> So how did Sloan get from 15 kV to 1000 kV using only an 18 sec sec
> inductor?  The pri feed was also tapped across part of the sec.  The Q must
> have been enormous.
>
> Dr. Resonance
>
>
>
>
> On Tue, Nov 24, 2009 at 1:55 PM, Martin Damev <mdamev@xxxxxxxxxx> wrote:
>
> > Hi Folks,
> >
> > Unfortunately Sloan's circuit described in the Phys. Rev. No. 47, 1935
> > isn't well suited for VTTC purposes.
> > A resonance transformer as described by Sloan works well as long as
> > the ohmic load parallel to the secondary resonant circuit (Rp) is high
> > compared
> > to the impedance of the secondary circuit, resulting in a high Q (for
> > example Q>30).
> > In a VTTC the ohmic and capacitive loading of the secondary circuit by
> the
> > spark is substantial, therefore with the spark growing the Qsec. drops
> and
> > the
> > resonant frequency drops. This fact necessitates the used of a tuned
> > resonant primary
> > circuit in order to obtain a useful impedance matching and energy
> transfer.
> > Sloan's circuit has only ONE resonance circuit, the secondary helix. The
> > primary circuit
> > is not resonating at the same frequency.
> > Several years ago i did calculations based on Sloans resonance
> transformer
> > circuit and I
> > built a test circuit using a power triode (Anode dissipation: 3.5kW). The
> > results were
> > absolutely disappointing. Since I followed Sloan's principle of not
> having
> > a tuned primary circuit
> > the oscillator always shifted to parasitic oscillations in the MHz-range
> > instead of oscillating
> > around 150 kHz. In other words: It was unstable and the efficiency low.
> > Reducing harmonics
> > by increasing anode conduction angle didn't really help. Performance was
> > very poor (8 inch spark with
> > 5 kVA apparent power at the HV-transformer input).
> >
> > IMHO it is necessary to use a tuned primary circuit with self-excited
> tesla
> > tube coils.
> >
> > Concerning large RF power sources using vacuum tubes, the largest
> > industrial RF generator I know,
> > was a 1000kW-induction oven built by the Swiss company BBC (Brown Boveri)
> > using three BTS150-2
> > high power triodes.
> >
> > -Martin
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Martin Damev
>  >
> >
> >
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> >
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