Standard wire bulb 220V 20W  (from microwave oven) - one lead connection other end free. This is a basic test of working the granade coil before you continue with other parts like push-pull etc.
The beauty of dielectricity

Hi John. Thanks. Just went back and reviewed that picture of yours. Yes the filament is glowing a little bit.
I can't tell from that picture how long the alligator clip lead is that is open circuit at the other end.
How long was this alligator clip lead which is connected to the light bulb, but not connected at the other end?
All the best...

  The incandescent bulbs will not light on just the induction from the output coil, with out an earth ground, or some type of virtual ground, like the wire of a certain size. At least as far as I've seen.

Sorry guys I am bothering you again with the push - pull but, should I suppress BEMF of the coils   I am thinking to put between central tap and both other end of the coils some diode. Also between the Gate and the Source 10Kohm resistor and small neon to give it some protection.   Isn't it in some way contra-productive to the functionality of that device?

Hi John. People are using snubber circuits to reduce the back spikes and ringing.
You can maybe check with Itsu or Hoppy to see what they are using, although I think they
may have posted that info already in this thread a while back.
All the best...

Hi John. People are using snubber circuits to reduce the BEMF spikes and ringing.
You can maybe check with Itsu or Hoppy to see what they are using, although I think they
have posted that info already in this thread a while back.
All the best...

I'm currently using 10nF (600V) in series with 4R7 resistor (5W) and parallel diode snubbers. I suggest that John tries a resistor values in the range 4R7 to 15R. Snubbers will consume considerable power. I tried TVS diodes / Schottky diode combos across both half of the primary windings but found that CR snubbers more effective. The most important thing is to get the leading edge spike down under the max voltage rating of the mosfet / IGBT.

  Hoppy:
  I can't remember just where it was mentioned that the superimposition should be DC from the HV pulser, to the magnetic induction coils (12,12, or 25,25, turns). 
   Maybe T-1000 knows, or remembers. In some of the older videos, perhaps.

I can't remember either, sorry. Only mixing two input signals in 2 input coils, not playing much directly on the wire..

Sorry guys I am bothering you again with the push - pull but, should I suppress BEMF of the coils   I am thinking to put between central tap and both other end of the coils some diode. Also between the Gate and the Source 10Kohm resistor and small neon to give it some protection.   Isn't it in some way contra-productive to the functionality of that device?

One thing I learned about BEMF - if you suppress it you make short circuit on the coil and create undesired effect when it goes back to initial state. It is much better to use it for recovery or charging capacitors in series... My personal preference is to let coil oscillate freely and in primary coil side I am adding blocking Shotky diodes in series to protect transistor...

Another interesting facts:
One of our rusian friend (I don't remember now which one) translated that Ruslan said he no relate his coils in turns but in meters...Let see how that is related to facts.

1. We know main grenade coil has 37.5m (more or less)
2. MenoFather translate in one of his previous post about  last 2KW device of Ruslan:
Reply #5996 :
Kacher secondary wound in last video 0.8-0.81 diameter wire 9 cm lengh on 5 cm diameter tube. And then to oposite direction with ticker wire little .
Lets assume that info correct, will calculate approximate length of Ruslans kacer:
      turn length on 5cm diameter pipe is about 16cm.
      number of 0.8mm turns fits in 9cm length of coil: 90/0.8 =  112.5 turns
      total length of kacer wire: turn length x no turns = 16 cm x 112.5 = 1800cm = 18m (more or less) which is very close of 18.75 (half of grenade)
3. About inductor length, it is nor 18.75m (1/2 grenade), nor 12.5 (1/3 grenade), but 9.375m (1/4 grenade) - I check myself and 9.375m fit nicely in 2 layer over grenade and display exactly proportions as in 2kw Ruslan's grenade.

Resuming all this:
Grenade:  37.5m - resonate at 1/2 wavelength
Kacer:      18m (or better 18.75m) - resonate at 1/4 wavelength as always kacer do
Inductor:   9.375m - I think its length isn't critical.

Any comments on this issue will be welcome.

Ruslan has removed input filter X, Y type capacitors from his 24V power supply for reason displayed in my earlier post (for complete isolate 220v side of 24V side of power supply).

Edit: If someone have that type of power supply, please check if there are capacitors in place. I suspect there is.

  Skywalker:
 
   "About DC HV positive pulse upon induction coils it seems you get it right.
Ruslan use those HV positive pulse too, interposed on induction coils, but he don't put diode on HV side on kacer, but between negative side of kacer and earth ground (cathode of diode on negative of kacer, and anode of diode to earth ground), which made only positive DC pulse on antena related to earth ground. But for that, negative side of kacer neither of push pull must not be connected directly to earth ground, the only one connection between the two is by means of that diode".
                                                                           end quote from Skywalker.

  I don't know if that works similarly or the same, as putting the diode on the end of the Kacher secondary output.   
Maybe it doesn't matter if the Kacher output is rectified DC, or pulsed AC, as they might both work. Try both ways, and see...
 
  I also tried placing a diode on the earth ground connection. But, not from the Kacher negative side. Just from the output coil on the grenade, which is also connected by a jumper to the 3 turn coil's impulse capacitor. Don't remember what happened, now.
   The thing is to try different things, to see what helps to increase the output.
 
  Ruslan's way of putting diode(s) to the earth ground must work better than not doing so,  or he would not have made that new additional change.
Should be followed, I would think...

  Also, Sky you mentioned that:
 "Inductor:   9.375m - I think its length isn't critical".
 
   It can effect the output from that inductor, and will decrease it, if it's too long. Like 18m, or so. This is where the diagrams are not correct, at least that I can see.
  Same thing with the earth ground cable. If it's too short? It can even kill the effect, as some may have already noticed.