Привет Itsunadze
I have seen you have a problem wit your mosfet. I sugest you to go back on КТ926А

Привет Сергей and all,

part of itsu's problem may be that the oscilloscope is connected to the high voltage across R3 towards the mosfet drain for the purpose of current measurement. Both potentials will quickly change in the moment when the mosfet is switched on. Then the sharp voltage step occurs also on the GND connection and the body of the oscilloscope. This has no direct galvanic connection and is floating against earth potential, but it has parasitic capacitance against earth potential. The whole thing becomes an antenna and sends out wideband spectrum electromagnetic waves that will surely couple back. I always try to measure from real earth potential = GND. Two probes on the oscilloscope can also be set to work as one differential channel when current measurements are required.

I want to understand how DALLY's coax winding works (or is supposed to work), before I go ahead with the soldering iron myself. I spent last night with OCR of the Russian book "Forming nanosecond pulses at high voltage" from 1970 and started translation. But there are too many OCR caused typos, so Google translator does not recognize many words. Correcting them takes a lot of time for me as I am neither a native Russian or English speaker. Месяц Г.А. explains there how to obtain pulses with less than a nanosecond rise time and hundreds of kilovolts (even one million Volt). I post what I have accomplished until now in coax_pulse.rar and will go ahead little by little next days. It seems to go in the direction of a Marx generator built from coax cables, but I am not yet sure.

Regarding the oscillations I post a schematic and photo of the Tesla coil I recently built. There I had a smooth rise time of about 30ns without any extra filters on the gate. The loop length --which verpies says shall be as short as possible (and he is right!)-- was and still is about 35mm (including the resistor). I hope this helps. Otherwise just disregard it.

I found an explaination of Step Recovery Diodes:

http://www.cst.com/Content/Applications/Article/Direct+transient+co-simulation+of+a+Step+Recovery+Diode+%28SRD%29+Pulse+Generator
http://www.cst.com/CMS/images/article420/Voltage%20and%20Current%20versus%20Time%20waveforms.gif

The generator is fed with a nice sine wave of little less than 5Vpp and a length of 17ns = 59MHz. The diode is always conducting even during the time when the voltage is negative. We see the current (red) a bit shifted to the right because of the two coils and the capacitor. Only shortly before the cycle ends the diode SMMD840 suddenly shuts off and causes a sharp pulse of about 500ps rise time. However, it is only 6Vpp. That's a long way to go until we find such diode able to create 1kVpp. Do you know of any SRD that can do this? Perhaps someone who has the Russian diodes at hand can use above mentioned circuit and check whether or not it shows the SDR-effect.

In an article of year 2001 Vitaliy Prokhorenko describes EXPERIMENTAL RESULTS using 1N5408 impulse rectifier diodes (reverse voltage VR=1000V, forward current IF=3A, reverse recovery time trr=200 ns). He got around 1ns and 40Vpp pulses in the best case reported. So I doubt any SRDs, a 1N5408  or even the magic КД226 will do the trick. I think we need something more powerful, to obtain 1kV pulses @ 1 ns. I hope the answer is in the 1970 book. I'll get back to you after I figured out what is suggested there.

kind regards

Waveforms from my autotriggering SassyClassE sstc, feeding 22 volts DC switched by an IRFP450N mosfet to the coil's 5-turn primary. Top trace is the mosfet drain signal showing the Class E waveform, mosfet switching fairly well near zero volts, bottom trace is HV field pickup from scope probe hooked to a bit of aluminum foil, suspended in space about 1/2 meter from coil secondary resonator, show at 200 v/div.
This circuit is simpler than yours, no oscillator needed as it is self-triggering and finds its resonant freq automatically if it's working right. Simpler than your circuit but less stable; it's easy to blow the mosfet. I think yours is better, but less simple. Probably doesn't blow mosfets like mine does, either.

Some interesting news on Joule ringer thread:
 http://www.youtube.com/watch?v=Zt5zulKQ1XE&feature=em-uploademail

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The biggest question is: How is that nanopulse (and its reflected copy) going to influence anything outside of the coax, if ideally the E&M fields are confined inside the coax?
Maybe the coax will be leaking or the AB Effect is the answer...

The same way the outside coils influence everything inside of the coax?
The coax picks up a lot of the voltage from the other coils also.. so why wouldn't it participate the same?
Maybe what goes through the inside doesn't?, maybe it's just the outside reflection backwards that counts... and maybe only the outside is picking up the high voltage drive?

Привет всем !!
.... to Alfeen As you have builded Tesla Transformer you have chance to start Energetic Revolution 2012 in Germany ...

I wish I had this chance, but this tesla coil takes 250W from the mains, makes very hot and dense sparks which can quickly melt 0,5mm copper wire, act as a "burning bush loudspeaker" and in the end wastes almost all of these 250W as heat. Not really an "Energetic Revolution". Some ordinary light bulbs can do this too! 

The feljpg_8864669_6350327.jpg you posted is lacking too many details and will hardly allow anybody to do a replication. From the Russian description I gather it worked inside a cage 2 meters in diameter? Can you point me to videos of this device?

Did you download the RAR archive and look into it? What does the guy say about coax cables?
kind regards

The basic suggestion to filter/block the ESR was heavy copper strips shielding the MOSFETS.








If the focused magnetic field is effective at any point to sense the energy, why not place many of the same magnetic field sensors all along the cable and harvest the combined energies?