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

[DC Cox <resonance@xxxxxxxxxxxx>]

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
>
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> Martin Damev
>
>
>
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