Roman aka “Akula0083” latest video of his china power device, explanation of  power o-scope wave forma are very interesting “Itsu”.. “h-waves” like yours and J.Bedini’s.
 
https://www.youtube.com/watch?v=TtjlIkgLJ7M&list=UU2aHNMDJzRW7YDd145_Pa2w
 
 Acca..[/font]

   Last night I connected up the yoke's output to my grenade coil. It did raise the voltage output to the bulbs, as compared to just running from the yoke core by itself.  So, Jeg, there is a purpose for the 25,25, turn resonator coil. I use 12.12 turns, instead. As going up to a higher turns count did not increase my output.
  Voltage goes substantially higher, once the 3 turn yoke coil with its 0.47uf cap is connected together with the 28 turn secondary, and the ground. Although I have not installed the 28 turn coil's frequency tuning caps yet. Should work better once I tune that part of the yoke secondary, with the grenade coils connected also.
 

Nick thanks for the feedback. My setup is the last drawing of ruslan (or bruto's copy) with a tuning cap in parallel with the 28 turns and grenade. When this 28T circuit is tuned gives me a nice 50W full bright just by itself. When i tuned the 3T circuit at the same 27KHz, no full bright any more. I changed polarities, number of turns, and way of winding it, but still the same results. It stops only when i tune this 3T circuit to the high freq. component. Perhaps it was not a good idea to tune the 28T circuit. I'll do some tests more and i will proceed as i already described to see what will happen.

All:
Last night I connected up the yoke's output to my grenade coil. It did raise the voltage output to the bulbs, as compared to just running from the yoke core by itself. 

Hi Nick. Too bad you don't have a scope so you can see the output waveform produced
by your ZVS driver. The Mazilli ZVS driver is prone to unstable/unwanted oscillations depending
on exactly how it is connected up to a transformer and load. I have observed that the ZVS driver can
oscillate at other frequencies than expected with various distorted waveforms, and can draw a fair bit
more power than normal than when it is operating normally and producing a clean sinewave. 

Your ZVS driver may possibly be running in such an unstable oscillation mode and thus drawing more
than the usual 3 A to 7 A at 12 VDC, assuming you are running at 12VDC. This can make the FETs
get very hot quite quickly. If you are running at 12 VDC, do you have a meter than can measure
currents up to say 10A? If you are drawing more than 6 A or 7A at 12 VDC from a 12 V battery, then
the ZVS driver may well be running in such an unstable oscillation 'mode'. Do your FETS get hot
when you have nothing connected to the secondary of the yoke core?
All the best...

Nick thanks for the feedback. My setup is the last drawing of ruslan (or bruto's copy) with a tuning cap in parallel with the 28 turns and grenade. When this 28T circuit is tuned gives me a nice 50W full bright just by itself. When i tuned the 3T circuit at the same 27KHz, no full bright any more. I changed polarities, number of turns, and way of winding it, but still the same results. It stops only when i tune this 3T circuit to the high freq. component. Perhaps it was not a good idea to tune the 28T circuit. I'll do some tests more and i will proceed as i already described to see what will happen.

In addition and the most important, when I tuned to 27Khz my 3T circuitry, the 1.7Mhz resonant freq of grenade, just disappeared. On the other hand, when 3T circuitry is un-tuned or tuned to a high freq then 1.7Mhz are still the resonant freq of grenade. I think this is another evidence that something goes wrong on there.

Конфа Руслана Кулабухова 
http://rusfolder.com/41984651

https://www.youtube.com/watch?v=fw2yeoovDng

Video here:  https://www.youtube.com/watch?v=9LNsvDhGIVE&feature=youtu.be

I just finished listening teamspeak conference (also available in youtube  - http://www.youtube.com/watch?v=NL55iHTZSw4 ) and see quite differences in GeoFusion and Itsu coils. So I will add corrections from what I heard in recording:
1) We are talking about wavelength = wire length and grenade coil wire length multiplied by 4 = full wavelength and this is your resonant frequency. No LC resonances except in induction heater part between yoke and primary coil for grenade coils!
2) The Grenade coil - It is receiver wound on tube of 50mm diameter with length of ~21cm length, full winding on it for layer forward and continue with second layer to same direction, then divide its length by 2, put the same cable from the end of 2nd layer until middle and wind into opposite direction direction until end then continue with second layer to same direction, then again divide by 2 and put the wire until middle from end of previous coil and wind into opposite again until end (the last half is in same direction as longest bottom) then continue layer on same direction. Then put wire across top coil and put inside of tube then make exiting under begining of coil. The total length of wire = 1/4 of resonant frequency. Also the inductance is minimal (microH range). The ground is also connected to the wire exiting from top of the coil and should be completely separate to avoid any noise as device is really sensitive to it.
3) The Tesla coil - you have to wind with with spacing between windings for getting higher frequency. You should get high voltage as possible to antenna (5kV+? voltage source) Also the wire length of Tesla coil must be tuned to match resonant frequency of grenade coil wire lentgh which is wavelength. When frequency matches with grenade coil the 25W bulb connected directly on grenade coil should start lighting up. You need to get best resonant frequency  of Tesla coil decided by wire length of grenade coil to have maximum effect. Also when you connect ground you have to do additional tuning for getting it again.
4) The antenna - it should have spacing at least by 2 fingers to make coupling between antenna and coils minimum as possible. Also the Tesla coil is your transmitter where energy is accumulated from surrounding and with antenna you will radiate grenade coil to absorb that energy.
5) The inductor coil on grenade coil - it must be half of wavelength and winded to opposite than bottom layer of grenade coil. Also each layer should start from same place and end (Please see how E. Leedskalnin PMH is winded) in middle of grenade coil.
6) About Yoke - the primary coil should be calculated to have 2 volts / 1 turn and is on middle of long secondary winding. The secondary coil for current source into grenade coil goes 1st on core with spacing left for 3 winds coil. The frequency is on up to 1/100th harmonic frequency of grenade coil resonance.
7) The power supply - the big NO from mains! You have to use 7Ah+ batteries for entire tuning so there will be no ground loops.
  The capacitors should be high voltage rated and must survive short circuits for continuous use.

The frequency is driven by wire length of grenade coil then you tune katcher for maximum output in grenade coil and then you tune induction heater circuit for harmonics resonance of grenade coil.
This is a way to sum voltage source from Tesla coil with current source from yoke. The frequencies must be tightly matching and any +/- 100khz differences outside of harmonics between Tesla and grenade coils will make system non-functioning.

Hopefully it helps.

P.S.> Itsu - I do not see you on skype anymore and it would be good if you contact me there so the lot of progress would be made in live sessions....

Hi magpwr. I think maybe you mean this video? This is not the original, but Wesley's translation of it:
https://www.youtube.com/watch?v=PPHipGkfSAY
All the best...

hi Void,

Thank you for finding the link.

I finally 100% know now that the old video of Akula was actually talking about "harmonics" which was not mentioned in translated video or not mentioned by Akula back then.

Take note guys Akula mentioned if this two frequency is not aligned it won't work.

Working Theory Of Operation For Meyer's Voltage Intensifier Circuit. 8-14-14 Gries Petty Research.:.
https://www.youtube.com/watch?v=4kLFFkAOARI

I know this seems entirely disrelated; but the same resonant effect within the wire is applied .....